Features: . Application: for Smart 12V mini ups widely use for fingerprint attendance machine, fire safety system, security monitoring system, wireless camera, CCTV camera, personal treatment system,Door security system, personal data assistant, emergency lighting, Alarm system, personal communication systems, radio, digital cameras, camcorders, video camera and more 12V devices. The first for time you need to install the 18650 battery,then press the button on the back of the circuit board to activate the use of this product.5.5x2.1mm port output is for DC 12V,Suitable for wifi Router LED Strip CCTV Camera and more 12V device. There is no stable voltage, 3 batteries are connected in series, the maximum is 12.6V, the minimum is 8V, the voltage changes with the battery capacity. When using the powerbank, you can not charge the power bank,Suitable for equipment that does not require voltage regulation. Specifications: Item Type: 18650 Li-ion Battery Power Supply Box Material: ABS Color: Black Size: 93x75x25mm 5.5x2.1mm input: for DC 12-13V 2A 5.5x2.1mm port output: for DC 12V 1A max Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 X DIY Power Bank Box(18650 batteries are not included)