YES - THERE IS ON/OFF SWITCH AT BACK OF THE SOLAR PANEL. IT WILL TURN ON AUTOMATICALLY AT NIGHT.

IMPORTANT NOTE - BATTERY IS 3.6V - 2000mA NI-MH able to light up 30 LED Lights brightly!!! 

Imagine the same battery 2000mA NI-MH powering up 60 LED Lights, it won't be as bright as the 30 LED lights.  60 LED lights will be underpowered.