Built-in solar panel charges the included 1200mAh Ni-MH battery. Enjoy over a year of worry-free operation! Low battery? Simply place in sunlight for 1-2 daysBuilt tough for harsh outdoor conditions (-20°C to +70°C). Dust-tight and protected against water jetsBuilt-in eco-friendly nickel-metal hydride battery, ultra-low power consumptionSolar charging, built-in battery powers the device when there is no sunlight(The product printed words may vary depending on the batch, but this does not affect use)Color: As ShownMaterial: plasticPackage Contents:1*Solar Rain Sensor1*GatewayOnly 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.