The light is powered by solar energy through solar panel. the solar panel converts sunlight into electric energy and then changes built-in AA Ni-Cd rechargeable batteries during the day .A light sensor turns on the light automatically at night .The light can work up to 8 hours at night after a full sunny day charging .The light doesnot only light up and decorate your house and garden, but also saves electrics energy. Remark: the life time of LED lamp is over 100000 hours; you never need to change it. Certifications: LED QTY: 4pcs VOLTAGE:1.2V/0.197W QTY (pcs):12 G.W. (kg):9.5 N.W. (kg):7.5 CTN (cm):54*36*29 Color: R/G/B/Y/W Stainless steel body Export Markets: worldwide Pricing term: FOB Shenzhen Payment details: negotiation