No. 2 refers to the battery charging circuit, light sensors, and solar panel. Acting out of the Sun as an energy battery store and forward to wongchon will work exposed to light at night.
No. 2 means the battery charger circuit. Light sensor and solar cells. To receive light from the sun. The energy stored in a battery And forwarded to cycle to work by detecting light at night.
No. 2 means the battery charger circuit, a light sensor, and solar panels. A light from the sun. The energy in the batteries. And forwarded to the circuit will work by detecting light at night.