... 1.Guard Tour Monitoring System 2.Rechargeable Lithium Battery 3.OLED display 4.Waterproof ,Light ... , remote equipment inspection, etc. Parts Feature1.Rechargeable 3.6V lithium battery by USB or charger2.Weight:142g Packing weight ... protectionTransmitUSBIndicationOLED display(128×64Lattice),vibration motor,indication lightBattery3.6V rechargeable Lithium BatteryRecharge Time1-1.5 hoursShockproofIt works ...