Features: Waterproof and durable, ensure a long time use. Can be packed into 4x18650 batteries and combined them to bicycle lights powered. Can put 4x18650 batteries in to power bicycle lights. Easy to use, you can use two or four 18650 lithium battery. With the phone charging function. With a power display function. Spezifikations: Condition: 100% Brand New Material: Plastic Weight: Approx. 140g / 4.9oz Can be packed into 4x18650 batteries and combined them to bicycle lights powered Output voltage: 8.4V, Input voltage: 8.4V Standard 5.5DC Interface (Case diameter 0.95cm, 0.5cm diameter within the interface) Cable: 60cm (it has the USB cable ) Can put 4x18650 batteries in to power bicycle lights Application Load 4x 18650 batteries (Batteries do not include) Easy to use, you can use two or four 18650 lithium battery With DC connector input, the output voltage of 8.4V. USB connector output voltage 5V, current 2A, with the phone charging function. With a power display function Package list: 1 * Battery Pack Cover Battery and charger are not included.