Switching Frequency up to 1MHz . Quasi-CV mode to Compensate for the Voltage Loss on Battery Internal Resistance and Trace Resistance Automatic Recharge. Protection for Battery Voltage Being Low than Input and Short Battery Good adaptability to Input Supply with Limited Driving Capability Battery Overvoltage Protection. Led indicator: " " LED is charge status indicator," OK"LED is fully OR Constant voltage mode; Operating Ambient Temperature-40℃ to ＋85℃ Parameter: 3-Cell(3S) 12.6V Version: Input voltage: DC 3-6V(Recommend DC 3.7V 5V) Input current: 2A(2A Version) Charging voltage: 12.6V Charging current: 0.74A(2A Version) Applications: PDA, MP3 Players, MP4 Players Digital Cameras Bluetooth Applications Game Players Notebook li-on li-po Lithium Battery 18650 Mobile phone Solar charging Audio equipment Portable Devices POS , Electric Fan TYPE-C charging equipment size:39x18x6.3mm Material:PCB colour:Green Package Contents: 2 x Li-ion battery charger Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.