Description: Features: brand new and high quality. 18650 or 26650 Battery is not included, Only Power Bank for Case. 1. Special and Only for 3x 18650 or 26650 Li-ion rechargeable battery , please install same battery capacity for usage 2. 12V for DC input and output, 5V for USB output to charge mobile phone faster 3.for DC 5.5x2.1mm interface has 12V charge input and output functions. 4.USB port is only for output, support connect to mobile phones or other digital products 5.Customers can choose their own battery, capacity from your custom, convenient customer to experience, large capacity to provide long for time endurance capability 6.Overcharge for protection and short circuit for protection. 7.Don'for t use the device in the water. Waterproof standard is IPX7 8.With ON OFF switch,easy to use. 9.If you use 18650 battery, you need to insert the battery converter. 10.With a Micro USB cable,you can charge your smartphones or tablets and more. Specifications: Material:Plastic+metal Color:Black Size: 9.6x6.3x6.3cm Cable length: 37cm Input: for DC 12.6V Output 1: 12V-12.6V (for DC) Output 2: for DC 5V-Max 2100mA 18650/26650 Batteries are not Included. Package includes: 1 X Waterproof 3x 18650/26650 battery box for case.(without battery ) 4 X 18650 to 26650 battery converter 1 X Micro USB cable