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Package included: 1x US Plug 12V 2A SWITCHING ADAPTER 1x Balance Charger Voltage Tester Special Features Ready-To-Charge, One step to finish charge process Ready-To-Display, Display the voltage at any time High-Charge-Accuracy, ±10mV(max) Multi-Protection, keep charging safe Auto recover the over-discharging battery Save Energy, Balance process do not need discharge SPECIFICATIONS Operating Voltage Range 9V-16V DC Operating Temperature -20 - 45 degree Cells Type Supported 2-4 cells Li- Ion/Li-Poly Input Power Request recommend Over 30W Max Charge Power 25W Charge Current 1500mA Charge Accuracy ±10mV Balance Current 1000mA Display Accuracy ±10mV Weight 76g Dimensions 81*50*20mm (L*W*H) 12V 2A SWITCHING ADAPTER Balancing the mean charge is shown below: ER2: adapter voltage is out of range or power shortage ER4: this is the self-test error, indicating a need for a good point of power, such as: power supply with 12V 3-5A is more suitable.