Casio Vintage Series B640WD-1AV Unisex Digital Watch, Silver

---------------------------------------------------------------------- [Dimensions] Case size (height x width x thickness): 38.9 x 35 x 9.4 (approx. mm), Strap: width approx. 15 (buckle side) - 20 (case side) mm, lug width approx. 18 mm, Band size: 135 - 200 mm, Weight: approx. 49 g [Materials] Case: Resin, Band: Stainless steel, Crystal: Resin glass [Waterproof performance] 5 ATM water resistance [Accessories] Japanese instruction manual (copy), instruction booklet in a foreign language, plain generic box (not a Casio box) [Band size adjustment method] Free slide type (separate tool required) 【Watch Functions】 ● Stopwatch (1/100 second, 24-hour counter, with split function) ● Timer (Setting unit: 1 second, Maximum setting: 24 hours, Measured in 1/10 second increments, Time-up sound for 10 seconds) ● Time alarm/Hourly time signal ● LED light (with afterglow function), Luminous color: Amber ● Full auto calendar ● 12/24-hour format display switching ● Accuracy: Average monthly difference ±30 seconds ● Battery life: Approximately 3 years (This is the value when the battery is replaced with a new one. The battery that comes pre-installed in the watch is a monitor battery used to check the watch's functions and performance, so its battery life will be shorter.)