Description Description: Features: brand new and high quality. for DC 5.5x2.1mm interface has input and output functions. for DC 5.5x2.1mm port for DC 8.4V LED Light or other devices USB 5V Port for Charging for Smart phone GPS Tablet PC or 5V LED Light and more,USB port only for output. 18650 Battery pack box:upgrading in traditional 18650 8.4V lithium battery group basis(Please use the same capacity batteries for installation) Improve replacement battery pack inconvenient shortcomings,greatly facilitate the users of the battery pack DIY requirements. No Battery, Only Power Bank for Case. 18650 batteries are not included in the package, you need to purchase separately. 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 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 for protection,for protection of the battery is more safe and sustainable,overcharge,overcurrent for protection functions. Magic strap to make installation more convenient and faster. Specification: Material:Plastic+metal Color:Black Input Voltage:DC 8.4V Output Voltage: for DC Port 8.4V USB Output Voltage:DC 5V USB Output Current: 1000-2100mA Standby current Under 75A Waterproof grade is IP67. Size: 9x4.8x4.5cm Power cable length: 27cm Magic strap length: 52cm 18650 Batteries are not Included Note Please put in battery in a right way. Charge it when power indicator light flashes. Donfor t use the device in the water. Waterproof standard is IP67. Package includes: 1x Waterproof 4x 18650 battery box for case.(without 18650 battery )