.5KGS Key Specifications/Special Features input(with computer):5V Battery capacity:1.2v NI-MH 800MAH Specifications: No software/driver needed . The Self-Chargeable battery are composed of a cap and a plug-in body. The battery can be charged in PC\\\'s USB port(about 6 hours) when detaching the cap. After the battery had been charged, put the cap back and put the battery in the battery compartment. Warning: keep it away from heat and fire. PACKING LIST: 2PCS/PVC CARD 48PCS/INNER BOX 96PCS/CTN N.W:2.5KGS G.W:3.0KGS MEASE:28*22*18CM G.W:3.0KGS MEASE:28*22*18CM