Specification: Material: Polysilicon Thickness: 3mm Size: 3.14x2.36 inch / 80 x 60 mm Packaging: PCB & Glue Working Voltage: 1.5V Working Current: 435mA Power: 0.65 W Open Circuit Voltage: 1.8V Short-circuit Current: 483mA Conversion Rate: 18% Working Tempertaure: -10~60 ℃ Solar Testing standard ( Light intensity: 40000lux,Temperature: 25℃) Package included: 3 pcs of Solar Panel Battery Matching Specs: Battery —— Voltage of Solar Panel 1.2V —— 2~2.5V 2.4V —— 3.5~4V 3.6V —— 5~6V 6V —— 7.5~9V 12V —— 15~18V Note: You should use them with a diode to prevent them from draining your battery/supercap at night.