Sky King 10A, LED Display Solar Charge Controller for solar panels to charge batteries with a USB port for USB charging. Built-in industrial micro-controller. Built-in Timer and light sensor, it could work for an outdoor solar lighting system. Settable voltage with a built in timer. _ _ Specifications: Rated Voltage: 12V 24V Auto _ Current: 10A _ Standby current: < 10mA _ USB Output Voltage: 5V/3A _ Operating temperature: -35~+60? _ Application: Camping/Hiking _ Voltage: 12V / 24V _ _ Note before buying: _ 1. Make sure your battery has enough voltage for the controller to recognize the battery type before first installation. _ 2. The battery cable should be as short as possible to minimize loss. _ 3. The regulator is only suitable for Lead Acid Batteries: OPEN, AGM, GEL. It is not suited for Nickel Metal Hydride, Lithium Ions or Other Batteries. _ 4. The charge regulator is only suitable for regulating solar modules. Never connect another charging source to the charge regulator. What's in the box 1 x 10A Solar Charge Controller