Voltage: 1.2V Capacity: 800mAh Chemical: Sealed nickel-metal hydride (NiMH) Charging Time: 3 ~ 4 Hours Via USB Quantity: 2 Charging Temperature: 32 ~ 110 Fahrenheit degrees Storage Temperature: -40 ~ 110 Fahrenheit degrees Color: Red Each Weight: 21g Package Include: 2 x Battery Viotek AA Rechargeable Batteries work just like normal rechargeable batteries--but simply pop off the lid to recharge by any powered USB Port. Ideal for use with wireless mice, keyboards, game controllers, and other household products with no need to carry or find a separate charger. Easily rechargeable on the go, in the office or at home.