Features: 1. Adopt industrial micro controller, charge and discharge parameters can be adjusted. 2. Full 3-stage PWM charge management. 3. Built-in a variety of protection functions including overcurrent, short circuit, open circuit, reverse connection, etc. 4. Large screen LCD display with backlight. 5. Dual MOSFET reverse current protection, low heating production. Specification: Model ( Optional ) YJSS-10A YJSS -20A YJSS -30A 12.6V (d e f a u l t, 11.5 - 1 3V adjustable ) Standby Curr ent <10mA USB Output 5V/2A Max Operating Temperature -35~60℃ Size 133*70*35mm / 5.2*2.7*1.3in Weight Approx. 1 4 8 g / 5 .2oz Package list: 1 * Solar Charge Controller 1 * Manual Note: 1. The regulator is only suitable for lead-acid batteries: OPEN, AGM, GEL. Not suitable for NiMH, Li-ion or other batteries. 3 . The battery cable should be as short as possible to minimize loss. 4. The charge controller is only suitable for regulating solar modules. Never connect another charging source to it. 5. The controller will be hot when running. Please install it in a well ventilated place. .