This is the A100 series that revives Casio's first resin case model F-100. The case is plated based on the first Casio resin case model F-100, released in 1978. The design features a functional button on the front. Main Watch Features: Stopwatch (measurement unit: 1/10 second; measurement range: 59 minutes 59 seconds 9 (60 minutes)) Time alarm, time signal. Auto calendar. LED light. Accuracy: ±30 seconds per month Battery life: Approx. 3 years (value when replaced with new batteries. The batteries already set on the watch are monitor batteries to check the functionality and performance of the watch, so the battery life will be shortened. )
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