This kind of Solar sensor lights use for the Portable Toilet and screwed onthe roof of the Portable Toilet, it's round shape and the square solar panel on the top of light. The light has onerechargeablebattery and according to thesolar panels to charge the battery. We have two special Solar Panel Lights, Portable Toilet Roof Solar Light andSolar Light with Alert Sound. Solar Panel:5.5V, 150mA, Poly-crystalline Battery:rechargeable Lithiumbattery, 3.7V, 2200mAh*1 LED Lamp:8LEDx0.066WEpistar Chip LED Luminous:7LumenLED LED Color Temperature:Cool White:5500-6000K; Lamp Luminous Flux:45LM Material:ABS Operation:PIR motion sensor Cable Length:all in one, no cable Working Time:The motion sensor will keep the light Onas long as there ismovement.Ifthere is nomovement, the light will switch off after 35 seconds. Charging Time:empty battery needs 12hours to getfullCharged Sensor area:5m and 60 degree angle Warranty: 1 Year Application:Roof Lighting, such as portable toilet Install: Easy to install, simply to cut a hole 50mm ina diameter in roofing, Unscrew clear lens and black nut from the unit.Leave the silicon O-ring in place.Switch light on by fully depressing white switch on bottom, then light should stay on.Insert lightthrough hole and screw the holding plate and clear light cover back on.Once in place, light will automatically