... : high quality silicon solar cell 140 x 22.5mm, 6V 40/60mA2) Included rechargeable battery: 0.4w 2.4v AA Ni-Mh Battery3 ... and transform into electricity, which is stored in the encased battery (2pcs rechargeable batteries in D-cell size)2) Warning lamp will ... , long-lasting, saves electricity5) Works normally and constantly with AA battery in case of the failure of rechargeable battery