1. Small volume. Smaller than similar products. 2. 4.5-5.5V power supply, applicable to a single lithium battery (unlimited in parallel), with a maximum of 1.2A. It can be used to stabilize 1A current as required. 3. Applicable to all types of 3.7V lithium batteries, including 18650 and aggregate batteries. 4. With overshoot and over discharge protection, the over discharge protection is 2.9V, and the charging cut-off voltage is 4.2V! 5. When there is no external input voltage, it automatically switch to the output mode, supporting small current, output 5V, and output about 450mA. If 1a is output, the voltage be about 4.9V-4.5V according to the power situation. Automatically switch the input and output, and charge the battery when the external voltage is input. Otherwise, when discharging, the charging green light flashes, the full green light stays on, the light does not light when discharging without load, and the blue light is on when discharging with load. Standby power consumption is about 0.8mA. Color: Black Material: PCB Package Contents: 10 x Type-c 5V charging module 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.