Main feature:Dimensions:255*22*9 mmNet Weight: 26gDisplay: LED DisplayDisplay temperature range: -10 - 50Step number display: 0~9999Data transmission: USB PortStep Count Accuracy: �� 5%Time error: 24H error (software can adjust the range of �� 99 seconds / day)Data memory can store about 120 hours of continuous pedometer dataShow steps: Step 0 to 9999 stepsBattery life: charge and discharge times> 300 timesPower supply voltage: DC = 5VRun Atmospheric pressure: 860 hPa ~ 1060 hPaOperating temperature: 0-45 degrees CelsiusPackage Weight: 0.200kg (0.44lb.)Package Size: 30cm x 22cm x 17cm (11.81in x 8.66in x 6.69in)