1、High Efficiency: Adopting advanced MPPT maximum power point tracking technology, the solar charge controller tracking efficiency reaches about 99%, with DC to DC conversion efficiency is about 93%. 2、APP Monitoring: The solar charge controller has Bluetooth function, allowing you monitor and adjust the controller parameters in real time through mobile phone APP. 3、Heat Dissipation Structure: The whole machine is made of integrated shell with multi heat dissipation slots, fully covered with sealed thermal glue for completely water resistant. 4、Versatility: Universal for 12V-24V system, default is 12V-24V adaptive system, you can also lock the 12V or 24V system, enhance system stability, reduce error operation. You can edit the battery charging and discharging voltage, and the discharge mode is adjustable. 5、Multi Stage Design: Adopt 3 stage PWM fast charging technology, automatic judgement, fast charging technology, the battery is not overcharged. Can be set up to on off charging, reduce charging interference, more suitable for battery small system use. 6、Adjustable Output Mode: Including 24 hour output, only light control output, and light control with timer output. Constant output is when the battery voltage is normal, discharging both day and night; Pure light control automatically turns on the load when the controller detects that the solar panel is turn on voltage point at night, and turns off the load when the solar panel voltage goes above the turn off point. (Auto turns off during the day and on at night, adjusts automatically for winter and summer seasons); Light control and timer mode is, turns on the load for a fixed number of hours when the controller detects that the solar panel is turn on voltage point at night, then turns off. Item Type: MPPT Solar Charge Controller Battery Type: 12-24V Li Battery Universal Battery Voltage: 12-24V Battery Charging Current: ≤20A Solar Maximum Input Power: 12V 300W/24V 500W Maximum DC Output Current: 15A Batteryless Mode: 12V Supported Battery Activation Function: Available Output Mode: Always On (24 hour Power Supply) Comm Method: Infrared + Bluetooth Product Size: Approx. 110 x 104 x 27.8mm / 4.3 x 4.1 x 1.1in Hole Spacing: Approx. 94-45mm-R4 / 3.7-1.77in-R4 Weight: Approx. 603.00g / 21.27oz 1 x MPPT Solar Charge Controller 1 x User Manual