40W Monocrystal Efficient Ultra thin Flexible Solar Panel Charging Set Kit Dual USB for iPhone Features: Flexible solar panel, suitable for surface mounting. High efficiency with conversion rate of 23-24%, a real time saver. Using industrial grade master chip, which is reliable and safe. Large-screen LCD display for easy view of the charging status. Adjustable charging and discharging parameters, with power-off memory function makes it easy e. Complete 3-stage PWM charge management. Full protection - Built-in overcurrent, short circuit protection, open circuit protection and reverse connection protection, all self-recovery type, no damage to the controller. Dual USB output, maximum current up to 2.5A, which is suitable for Apple phone charging, and other digital devices. Dual MOS anti-measurement circuit with ultra low heat, safe e. Specification: Type: 40W Monocrystal Efficient Ultra-thin Solar Panel Set Material: Monocrystal Weight: Approx. 772g Size: Approx. 54 * 43cm / 21.3 * 17in   Package list: 1 * Solar Panel 1 * Alligator Clip 1 * Car Charger 1 * Controller 1 * Bracket 1 * 3M Extended Alligator Clip 1 * Instruction Manual Note: 3. This controller is ONLY suitable for all kinds of lead-acid batteries, including openings, seals, colloids, etc. Do not use on other batteries (including lithium batteries, nickel metal hydride batteries, etc.). 4. The controller intelligently uses the photovoltaic panel as the charging source. Do not use DC or other power sources as the charging source. 5. The controller will heat up when it is running. Please pay attention to the controller installed on a flat, well-ventilated surface. 6. Please allow slight error due to manual measurement. Thanks for your kind understanding.