18650 Power Bank USB DC 7.4V 8.4V Output Charge Wireless Charger Battery Box

Description: Features: The first 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. 2x Lithium battery in series directly output 7.4V3A 4x Lithium battery output is 8.4V. 5.5x2.1mm or 3.5x1.35mm port output is DC 7.4V or 8.4V Suitable Bike LED Light for and more. As USB charger for Cellphone Tablet and more devices with DC adapter easy to use. With overcharge overdischarge overload short circuit and other protection. Specifications: Item Type: 18650 Li-ion Battery Charger Box Material: metal Color: Back Size: 9.3x8.6x2.7cm input: DC 8.4V 5.5x2.1mm port output: DC 8.4V USB Output: 5V 2A Package includes: 1 X DIY Power Bank Box(18650 batteries are not included) 1 X DC adapter