Dock Power Connector USB Port Battery Adapter for Charging Feature:1. Reliable Use: Ensuring convenient power conversion with little consumption, the battery adapter enables stable power supply.2. Easier Works: Comes with sleep function, cut off voltage, power display and LED light, which largely simplifies your works.3. Great Design: When power off, the self protection function can well protect the circuit and extend the service life as well.4. Firm Locking: Dual USB port together with firm battery locking will bring more convenience to the operation, very reliable.5. Easy to Install: Light in weight and compact in size, the easy installation can be quickly completed within minutes. Specification:Item Type: Battery AdapterWorking Voltage: 18V-21VMaterial: PlasticBattery Parameters: 1 x Battery (not included)Power Bank Converter Function: 1. With sleep function, no self power consumption; 2. With cut off voltage, it is safer to use; 3. With power display; 4. LED light; 5. Dual USB card slot. Weight: 127 g / 4.48 oz(approx.)Package List:1 x Battery Adapter How to use:Installthebatteryontheconverter,whichisnotincluded,anduseitasapowerbank.