Battery: 180mAh, 2mA/3.7V. Material: Aluminum alloy+ plastic. Chips: Broadcom 3.0. Key: 81. Charging time: 2 hours, working time 80 hours, standby time 2 month. Unit size:35.8*10*0.9cm/ Fold size 17.8*10*1.8cm. Net weight: 208g.