Feature: 1. Charge the battery when there is power, and automatically use the battery when power is off. The battery is automatically charged and discharged 2. With input reverse connection, overheating, overdischarging, and short circuit protection, you can use the UPS Module with confidence 3. At least 20AWG wire should be used for welding input and output, and the wire length should not exceed 10cm/3.9in 4. The control board will generate heat when working, so keep a certain distance from the battery when installing 5. Suitable for routers, switches, alarms, cameras and other equipment to be used as backup power after power failure Specification: Item Type: UPS Module Material: Phenolic Resin Input Voltage: DC5V-12V (this voltage is the voltage when charging the battery) Output Voltage: DC9V or DC12V Can Be Selected (default is 9V, you can also change the jumper to set to 12V, the output voltage is the voltage when only using battery power, if there is a charging input, the output is equal to the input) Output Power: 12W Maximum Battery Capacity: 1-3AH (maximum 5AH) Board Size: Approx. 50 x 20 x 6mm / 2.0 x 0.8 x 0.2in Purpose: Suitable for Use As Backup Power Supply After Power Failure of Routers, Switches, Alarms, Cameras and Other Equipment. Package List: 1 x UPS Module Note: 1. BAT connection (please connect the battery in the last step, this is very important) battery 3.7V lithium battery or Li‑pol, battery capacity: 1‑3AH ( maximum 5AH )2. At least 20AWG wire should be used for welding input and output, and the wire length should not exceed 10CM3. If the input is connected to the output, a loop will be formed, and the loop will lose 0.4‑0.6mA current4. Application description for accessories of charging indicator: Red light‑emitting blue diodes with common anode are used. The blue light indicates whether the battery is loaded; the red light indicates whether the battery is charged, the charging red light is on, and the red light is off when it is fully charged; the red light flashing indicates that the battery is abnormal or not connected. The indicator lights need to be configured by themselves. It is recommended to select the red and blue indicator lights to be effective, and the other color two‑color indicator lights are invalid. Note: The output short circuit of the control board is invalid when charging, so please use this function with caution. When the control board is working, it will heat up, so keep a certain distance from the battery when installing!