Description: Features: 100% brand new and high quality. DC 5.5x2.1mm interface has input and output functions. DC 5.5x2.1mm port for 8.4V LED Light or other devices USB 5V Port for Charging Smart phone GPS Tablet PC or 5V LED Light and more. 18650 Battery pack box:upgrading in traditional 18650 8.4V lithium battery group basis 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 DC dual output power supply function,DC output voltage is 8.4V(can power the 8.4V 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 protection,protection of the battery is more safe and sustainable Specification: Material:Plastic+metal Color:Black,Blue,Red Input Voltage:DC 8.4V Output Voltag: DC Port 7.7V-8.4V Overcharge protection voltage 8.4V Over discharge protection voltage 5V Discharge protection current 9A Standby current Under 10A USB Output Voltage:DC 5V+/-0.2 USB Output Current: 1000-2000mA 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't use the device in the water. Waterproof standard is IPX4. Packing list: 1x Waterproof 6x 18650 battery box case.(without 18650 battery )