This solar panel kit is made of monocrystalline silicon, ABS, rubber and copper material with strong durability, it is designed for long-term use. Practical and energy saving, it is suitable for climbing, hiking for RVs, trailers, campers, boats, yachts, etc. Features -Color: Black. -Material: Monocrystalline Silicon, ABS, Rubber, Copper. -Size: About 42.00X28.00X2.50cm/16.51X11.00X0.98in. - The solar panel is made of monocrystalline silicon material, durable and practical for long serving time. - High conversion efficiency, good output efficiency, light weight, easy to carry, strong applicability. - Strong resistance, can withstand different environments, good waterproof performance. - Designed for outdoor applications, such as car, campers, ships, automobiles, etc. - The component contains a bypass diode, and the circuit uses input over current protection and protection design. Specification: Maximum power (pmax): 20W. Open circuit voltage : 20V. Maximum power voltage (vmpp): 18V. Short circuit current ( ): 1.1A. Maximum power current (impp): 0. . Output: USB 5V DC5521 18V. Standard Test Conditions: AM=1.5. Irradiance=1000W/square meters. temperature = 25 degree centigrade. Package list: 2 panel 2 charger 2 x battery clip 8 x suction cups 4 x 2 x manual