1. Solar panel is used to charge mobile phones, MP3, pad or other devices with USB charging. 2. Dual USB female port, easily charge the device via the USB charging cable. 3. You can place the panel in the sun and use it to directly charge your device. 4. for outdoor cycling, climbing, hiking, camping, travel, etc. 5. Integrated industrial microcontroller. Complete 4-stage PWM load management. One-key configuration, digital display, automatic memory function. Dual mosfet reverse current protections, low temperature productions. Built-in short circuit protections, open circuit protections, reverse protections, overload protections. Solar panel Specification: USB output: 5V USB ports quantity: Double Solar panel voltage: DC12-18V Solar panel power: 10W Controller Specs: Model: PWM Buck charge: 28.8V Floating charge: 27.4V USB output: 5V / 3A 5V / 2A Self-consumption: less than 10mA Discharge stop: 21.4V Voltage: DC 12V / 24V Maximum solar input: less than 50V Rated operating current: less than equal 20A Discharge reconnection: 25.2V Working temperature: -35 Celsius - 60 Celsius Output voltage: 12V / 24V automatically distinguish voltage colour:Black Material:plastic Package Contents: 3 x Solar Panel 3 x DC18V Output Clip 3 x Car Charger 12 x Suction Cup Adsorption 3 x Solar Controller(50A) 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.