Automatically adapt to the battery voltage 12V/24V, making it possible to easy operation. This product control the battery voltage and turn on the circuit. Also, when the battery voltage rises to a certain level, it will stop the battery charging. Features: The solar charge controller equipped with dual USB ports, support 5V/2.5A max USB output. This product provides short-circuit conservation,open-circuit conservation, reverse conservation, overload conservation. Perfect and safe to use in various applications, such as home, industrial, commercial etc. Solar controller can clearly indicate the status and data, it can be conveniently switched modes and parameter configuration. This product is perect for lead-acid batteries: OPEN, AGM, GEL, not suitable for nickel hydride, lithium ions, or other batteries. Using PWM charge management, actually improve the charging efficiency. Adjustable floating charge voltage, discharge stop voltage and discharge reconnect voltage. Specifications: Battery voltage: 12V/24V Auto Adapt Material: ABS Item color: blue & black, orange & black (optional) Max power: 120W(12V), 240W (24V) Charge current: 10A, 20A, 30A, 40A, 50A 60A, 100A (optional) Discharge current: 10A, 20A, 30A, 40A, 50A 60A, 100A Max solar input: ＜50V Floating charge voltage: 13.7V (defaul, adjustable) Discharge stop voltage: 10.7V (defaul, adjustable) Discharge reconnect voltage: 12.6V (defaul, adjustable) Charge reconnect: 13V Self-consume: ＜10mA USB output: 2 way USB output, 5V 2.5A Operating temperature: -35~+60℃ Item size: 133 * 70 * 35 mm / 5.24 * 2.76 * 1.38 in Item weight: 134 g / 4.73 ounce Package size: 135 * 80 * 40 mm / 5.31 * 3.15 * 1.57 in Package weight: 165 g / 5.82 ounce Notes: 1. Make sure your battery has enough voltage for the controllers to recognize the battery type before installation. 2. The battery cable should be as short as possible to minimize loss. 3. The regulator is ONLY suitable for lead acid batteries: OPEN, AGM, GEL. (NOT suitable for nickel metal hydride, lithium ions or other batteries) 4. This controller can ONLY use photovoltaic panel as charging source, do NOT use DC or other power supply as charging source. Package list: 1 * Solar Charge Controller 1 * Instruction