1. High cell efficiency with quality silicon materials for long term output stability and reliability. 2. Strictly quality control the stability and reliability, totally 23 testing procedure to do quality control 3. High transmittance low iron tempered glass with enhanced stiffness and impact resistance 4. Solar panel connector leads for easy plug and play ! Type: 30W Solar Panel Tolerance: +/-5% Battery Voltage: 18V Type of Solar Cell: Monocrystalline Open Circuit Voltage(Voc): 18V Maximum Ystem Voltage: 18V Temperate Coefficient of Isc: (010+/- 0.01 ) %/C Temperate Coefficient of Voc: - (0.38 +/-0.01 ) %/C Temperate Coefficient of Voc: -0.47%/C Temperature Range: -40 Celsius to +80 Celsius Colour:black Material:Monocrystalline silicon Size:280 x 380 x 2.5mm Package Contents: 1 x 30W Solar Panel 1 x Connector Cover Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.