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Model No.: IW1 Bluetooth 5.0 1.4″ TFT LCD Battery 250mAh Working Voltage: 5V-500Ma Weight: 34g Waterproof Rating: IP68 Working Time: 10days
Model No.: EW1 Bluetooth 5.0 1.3″ TFT LCD Battery 210mAh Working Voltage: 5V-500mA Working Temperature: -10℃ to 40℃ Weight: 36g Waterproof Rating: 5ATM Working Time: 5-7 days