# Casio Ring Watch CRW-001-1 The text version of the iDevice Guide at https://idevice.com/smart-watches/casio-ring-watch/roadmap. Same data as the page, last updated 2026-10-10. > A working Casio digital watch on a stainless steel ring. Time to the second, dual time, a stopwatch, an LED light and about two years on a button battery. $135 at Casio. - Status: On sale - List price: $135 (The maker's own starting price.) - Released Dec 26, 2024 (source: [Casio America](https://www.prnewswire.com/news-releases/celebrate-casios-50th-anniversary-with-innovative-crw-001-ring-watch-302336573.html)) - Guide: https://idevice.com/smart-watches/casio-ring-watch/roadmap - Last updated: 2026-10-10 ## Can it do this? - **How long does the battery last?** About 2 years on an SR621SW button battery, which can be replaced. There is nothing to charge. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-how-long-does-the-battery-last)) - **What does it cost?** It costs $120. That is the list price. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-what-does-it-cost)) - **Does it have GPS?** No, it has no GPS. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-have-gps)) - **How heavy is it?** 16 g, with a 25.2 x 19.5 x 6.2 mm stainless steel face. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-how-heavy-is-it)) - **What is it made of?** It is made of stainless Steel. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-what-is-it-made-of)) - **Does it take an ECG?** No, it does not take an ECG. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-take-an-ecg)) - **Does it measure blood oxygen?** No, it does not measure blood oxygen. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-measure-blood-oxygen)) - **Does it track heart rate?** No, it does not track your heart rate. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-track-heart-rate)) - **Does it track HRV?** No, it does not track your HRV. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-track-hrv)) - **Does it track sleep stages?** No, it does not track sleep stages. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-track-sleep-stages)) - **Does it read skin temperature?** No, it does not read your skin temperature. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-read-skin-temperature)) - **Will it warn me about an irregular rhythm?** No, it does not watch for that. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-will-it-warn-me-about-an-irregular-rhythm)) - **Does it count steps?** No, it does not count steps. ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#can-does-it-count-steps)) ## Works with - **How does the Casio Ring Watch handle battery replacement?** Works. Yes. It runs about 2 years on an SR621SW button battery, and Casio sealed the ring so the battery can still be replaced. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). Checked 2026-10-10. - **How does the Casio Ring Watch handle ring sizing?** With a limit. It fits a US size 10.5 finger (20 mm inner diameter). Two spacers in the box take it down to 19 mm or 18 mm. Casio does not resize the ring, so larger fingers are out. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). Checked 2026-10-10. ## Questions ### How much does the Casio Ring Watch cost? Casio's US store lists the CRW-001-1 at $135.00. It launched at $120 in December 2024. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faq-how-much-does-the-casio-ring-watch-cost)) ### Is the Casio Ring Watch a smartwatch? No. It is a 3-button digital watch with a 7-segment LCD. It shows the time to the second, the date, dual time and a stopwatch, and it runs on a small button battery. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faq-is-the-casio-ring-watch-a-smartwatch)) ### What ring size is the Casio Ring Watch? The ring has a 20 mm inner diameter and a 62.8 mm circumference, which fits a US size 10.5 finger. Two spacers bring the inner diameter down to 19 mm or 18 mm. Casio does not resize the ring. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faq-what-ring-size-is-the-casio-ring-watch)) ### How long does the battery last? Casio rates it at about 2 years on an SR621SW button battery. The ring is sealed so the battery can still be replaced, and there is nothing to charge. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faqs-how-long-does-the-battery-last)) ### Is the Casio Ring Watch waterproof? Casio rates it water resistant for everyday use. It does not give it a depth rating for swimming. Source: [Casio America](https://www.prnewswire.com/news-releases/celebrate-casios-50th-anniversary-with-innovative-crw-001-ring-watch-302336573.html). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faqs-is-the-casio-ring-watch-waterproof)) ### How big and heavy is it? The face measures 25.2 x 19.5 x 6.2 mm and the whole ring weighs 16 g. The case, case back and ring are one piece of stainless steel. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faqs-how-big-and-heavy-is-it)) ### Does the Casio Ring Watch have a light and an alarm? Yes. It has a white LED backlight, an alarm with an hourly time signal, and Time Flash, which blinks the light at a time you set and every hour on the hour. The light may not be visible in bright light. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faqs-does-the-casio-ring-watch-have-a-light-and-an-alarm)) ### What can the Casio Ring Watch do? Time to the second in 12 or 24-hour format, an auto-calendar, dual time, world time, an alarm and a 1/100-second stopwatch. Casio rates it accurate to within 30 seconds a month. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/). ([on the Guide](https://idevice.com/smart-watches/casio-ring-watch/roadmap#faqs-what-can-the-casio-ring-watch-do)) --- Source: iDevice (https://idevice.com). Every spec, rumor and grade above links to where it came from. Full Guide: https://idevice.com/smart-watches/casio-ring-watch/roadmap. This file: https://idevice.com/guide-text/casio-ring-watch.md. ## Questions and answers ### Using it **What does it cost?** It costs $120. That is the list price. Source: Casio **Does it have GPS?** No, it has no GPS. Source: Casio **How heavy is it?** It weighs 16g. Source: Casio **What is it made of?** It is made of stainless Steel. Source: Casio **Does it take an ECG?** No, it does not take an ECG. Source: Casio **Does it measure blood oxygen?** No, it does not measure blood oxygen. Source: Casio **Does it track heart rate?** No, it does not track your heart rate. Source: Casio **Does it track HRV?** No, it does not track your HRV. Source: Casio **Does it track sleep stages?** No, it does not track sleep stages. Source: Casio **Does it read skin temperature?** No, it does not read your skin temperature. Source: Casio **Will it warn me about an irregular rhythm?** No, it does not watch for that. Source: Casio **Does it count steps?** No, it does not count steps. Source: Casio ### Sizing and fit **What sizes does it come in?** Stainless steel case, bezel and ring; face 25.2 x 19.5 x 6.2 mm; ring inner diameter 20 mm (US 10.5), with spacers for two smaller sizes. Source: Casio ### Price and models **Is there a newer one?** No. The Casio Ring Watch CRW-001-1 is the current model. Source: iDevice **How much does the Casio Ring Watch CRW-001-1 cost?** List price: $135 at Casio ($120 at launch). Source: [prnewswire.com](https://www.prnewswire.com/news-releases/celebrate-casios-50th-anniversary-with-innovative-crw-001-ring-watch-302336573.html) ### Returns and warranty **How long is the warranty?** 1-year warranty Starts the day you buy it. Source: [Casio](https://www.casio.com/us/watches-warranties/) **Is the battery covered?** Battery wear not covered The battery is excluded as a consumable. Source: [Casio](https://www.casio.com/us/watches-warranties/) ### In the box **What's in the box?** Casio Ring Watch, Two size-adjusting spacers. Source: [Casio](https://www.casio.com/us/watches/casio/product.CRW-001-1/)