180mAh, 2mA/3.7V battery. Material: plastic and aluminum alloy. Broadcom 3.0 chips. 81 is the key. Two hours for charging, eighty hours for working, and two months for standby. The unit is 35.8*10*0.9 cm, and the fold is 17.8*10*1.8 cm. 208g is the net weight.