Model Number: RB40 Type: AAA Material: Lithium-ion battery Charging Method: Type-C usb cable Charging Voltage: 5V Nominal Voltage: 1.5V Typical: 400mAh Capacity: 750mWh Diameter: Min 9.8mm, Max 10.5mm Height: Min 43.5mm, Max 44.5mm Weight: 6.9(+-0.5)g Charging time: 2 hours (+-0.5) LED Indicators: Blink when charging,Stay on when full charged