Ni-Mn Rechargeable Battery DT-2020 Charger voltage: DC12V(+2V or -2V) Charger electric current: 100mA Output voltage /power: 8.4V/20W Battery Box operation time: >=3 hours Volume: 155mm X 110mm X 120mm Weight: around 760g Special design for DVB-T8066,DVB-T8099 and other TFT LCD monitor/TV