Features:  - Suitable for small spaces or crowded areas such as RVs, boats, campers, boats, houses, gardens, sheds or farms.  - Provide proper power supply for 12v TVs, laptops, lamps, refrigerators and other operating equipment.  - Flexible, light weight, easy to install and suitability.  - Solar energy and efficient solar charger circuit. Environmental protection and energy inexhaustible.  - Portable and frame design fit for outdoor and indoor usage.  - Constructed by high quality material, eco-friendly, waterproof, durable and sensitive.  - Portable and lightweight, easy for carrying.  - Suitable for outdoor activities, emergency, and outdoor working.     Specification:  Name: Monocrystalline Solar Panel.  Size: 420*420mm/ 16.5*16.5 inch.  Thickness: 2.5 mm.  Interface: USB.  Number of Interface: 2.  Ambient Temperature: -40°C~85°C.  Air Resistance: 50psi (2400pascals).  Snow Resistance: 113psi (5400pascals).  Controller: No Controller / 30A Controller / 60A Controller / 90A Controller.     Package Contents:  1 * Solar Panel.  1＊No / 30A / 60A / 90A Controller (OPTIONAL).  4＊Sucker.  1＊Alligator clip.  1 * Car Cigaarette Lighter.  1＊Cable.     Notes:  1. Please don't scratch the surface of the panel with a sharps object. Do not modify the PCB circuit unless you are professional. We have no responsible for any a result from this.  2. Make sure the solar panel exposed to direct sunlight to ensure the best charging efficiency while charging. Best working time: 9:00-17:00 ( Cloudless Weather ).  3. Product deigned to extend battery life and emergency usage. Please choose other higher current products if you want a faster charging speed.