Dual Bay ChargerCharges two batteries simultaneouslyLCD DisplayThe LCD display shows charging status, charging voltage, USB output, and DC outputUSB OutputCharge or supply power for MP3 devices, mobile phones, digital cameras, and other related devices with a USB power input – even while you're charging your digital camera or camcorder batteries. USB output is also displayed on the LCDTest ButtonTest the charge of a battery even with the Duo Charger unplugged by sliding the battery into the charging plate and pressing the Test button. Press the button a second time to display the voltage of the batterySafety FeaturesShort-circuit protection, overcharge protection, and overheat protectionBattery Type: Lithium-ionPower Input: 100-120V AC, 50/60 Hz12/24V DC, 2APower Output: 1.2-8.4V DC, 2A (max)USB: 5V DC, 2A (max)Charging Time: 2-6 hoursOperating Temperature: 32 to 104 °F (0 to 40 °C)Storage Temperature: -4 to 140 °F (-20 to 60 °C)Dimensions : 4.9 x 4.5 x 1.75" (124 x 114 x 44.5mm)Weight: 7.7 oz (218 g)