Excellent Heat Dissipation: Tempered glass cover & All aluminum shell design which let controller has excellent heat dissipation even when the instrument works for a long time. Great charge performance in high temperatureBefore contecting Bluetooth App,please make sure the " Bluetooth" and "GPS" functions in your mobile phone are both available and "ON" at the same time.by LCD Display Screen & Remote Monitoring Bluetooth App Control (ChargePro 2.0): Pairing the solar controller with your phone (iOS/Android), which can not only check device operating data and status but quickly determine system faults and modify controller parameters. solar controller makes seeing output and history data a breeze. The remote app control provides 15 feet signal.Charge Controller in Highter Tracking Efficiency: Solar charge controller adopts advanced MPPT technology that ensures fast and stable track the maximum power point, high tracking efficiency of up to 99%, and conversion efficiency of 98%. Maximizing the energy from solar panels to charge your system. It auto detects 12V or 24V DC system voltages.With temperature sensor, it is able to support lead-acid battery temperature compensation. also has dual MOS circuits to prevent reverse current and reduce heat during operation. Maintain your battery at all times which increases the thermal efficiency of the solar charge controller.Type:40Acolor:As shownMaterial:aluminumPackage Contents:1 set x solar charge controllerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.