Features: brand new and high quality. Without 18650 battery,You need to prepare 6x 18650 batteries yourself to use. for DC 5.5x2.1mm interface has input and output functions,with for DC adapter,easy to use. for DC 5.5x2.1mm port for 12V LED Light Router or other devices USB 5V Port for Charging for Smart phone GPS Tablet PC or 5V LED Light and more. Suitable for bike USB 5V LED light or 12V LED light Router,and charge for smart phone tablet PC and more. Improve replacement battery pack inconvenient shortcomings,greatly facilitate the users of the battery pack DIY requirements,without spot welding battery,thereby greatly reducing the battery internal resistance,improve the battery discharge performance,so as to effectively improve battery life Power supply:you can use 18650 rechargeable lithium battery as a power source The output side:USB and for DC dual output power supply function,for DC output voltage is 12V(can power the 12V device,such as the bike light),USB output voltage is 5V(can power the cellphone and other 5V device),to meet a wider usage scenarios,the product comes with overcharge and over discharge for protection,for protection of the battery is more safe and sustainable Specification: Material:Plastic+metal Color:Black,Red,Blue Input Voltage:DC 12V Output Voltage: for DC Port 12V Overcharge for protection voltage 12V Over discharge for protection voltage 5V Discharge for protection current 9A Standby current Under 80A USB Output Voltage:DC 5V+/-0.2V USB Output Current: 1000-2100mA Size:9x6.5x5cm Cable length:57cm Belt length:53cm 18650 Batteries are not Included Note Please put in battery in a right way. Charge it when power indicator light flashes. Don'for t use the device in the water. Waterproof standard is IPX4. Packing list: 1x Waterproof 6x 18650 battery box for case.(without 18650 battery ) 1x 5.5x2.1mm adapter