Dual USB Solar Panel Charging Controller Module 5V 3A

From the shop's description

Features: Automatic identification for telephones and other smartphones 5V constant voltage output Automatic restart (after weak sun, stop charging, automatic recovery after discharge to strong sunlight) Compatible with most smartphones, tablets, ipads, digital cameras, etc. Specifications: Input Voltage: 5-30V 3A (max) Output Voltage: 5V 3A (max) Maximum output current: 2000mA (single USB)/3000mA (dual USB) Conversion efficiency: 95% Product Size: 4. 27 x 4.18 x 1.27cm