Tenergy Advanced Universal Charger TN190 (4 Channel AA/AAA/C/D/9V Ni-MH Charger with LCD Display and USB Power Outlet) Recharges 1 to 4 pieces of AA/AAA/C/D Ni-MH batteries and 1 to 2 pieces of 9V Ni-MH batteries. Recharges batteries in single or group - with 4 individual charging channels for AA/AAA/C/D batteries and 2 individual channels for 9V batteries. Built-in USB outlet (output: 5V DC 500mA) - recharge and power up your personal digital devices Automatic charge and discharge function. Intelligent microprocessor controlled Automatic charging current selection for the different size of batteries. Powered by an external AC adaptor (100-240V AC) for worldwide use. Unique designed with blue Electric LCD screen to indicate the battery status: Charge, Discharge, Full, Bad. With backlight button - press it once and the backlight will turn on for 10 seconds under trickle charging mode.