Automatic voltage identification; activation function with power loss; components Short circuit protection; reverse connection protection; overload protection; undervoltage protection. 3.7V battery fully voltage 4.2V, over discharge protection 3.2V 7.4V battery fully voltage 8.4V, over discharge protection 6.4V 11.1V battery fully voltage 12.6V, over discharge protection 9.6V Model Number:lithium battery solar lawn light circuit board Maximum Current:3A Application:Lighting Controller Supply Voltage:3.7V/7.4V/11.1V Application:Garden light Tpye 1:lights Tpye 2:Camping lights Tpye 3:Outdoor lights 1:Backyard Garden light 2:Backyard light 3:Street light Panel voltage: Less than 30V Recommendation: Please charge the 3.7v battery with a 5v battery board, and the power is 11W Please charge the 7.4v battery with a 9-12v battery board, and the power is 22W Please charge the 11.1v battery with the 18v battery board, and the power is 36W color:Green Material:plastic Package Contents: 1 x Solar Light Circuit Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.