BESTRUNNER Bluetooth 4.0 Smart Wrist Watch Bracelet Pedometer Calorie Counter Sport Tracking Screen Size:Approx.2.6x0.8cm Band width:Approx.2cm;Band Length:Approx.25cm Material: OLED Screen with Silicone Belt Style: Watch / Pedometer / Sleep Monitoring / Tracking Calorie Please read the instruction on your left !!!!!!!!!