Features Excellent aluminum material, lightweight, good strength and good corrosion resistance. Communication supports Bluetooth mobile phones, can realize wireless monitoring. The product is suitable for RVs, yachts, households, campsites and other scenes. The maximum efficiency of power point tracking is up to 99.9% or more, realize automatic tracking. IP54 high waterproof rating, convenient and durable, easy to install. Specification: Item Type: Solar Controller Model No.: Win500-MPPT Material: aluminium. System voltage: DC12V/24V (automatic identification) Power supply: 12VDC: 260W, 24V DC: 520W Maximum charging current: 20A Maximum MPPT Tracking Efficiency: >99.9% Maximum load conversion efficiency: 98% Communications: Bluetooth Grounding Type: Negative Earth Connection terminal: 10AWG (5mm²) Working environment temperature: -20~+55℃ Working environment humidity: 0-100%RH Protection level: IP54. Size: approx. 20 mm/0.8 inches. 64 mm/2.5 inches. 4.5 mm/0.2 inches. 107 mm/4.2 inches. 164 mm/6.5 inches 32 mm/1.3 inches. Diameter: approx. 4 mm/0.2 inches. Package list: 1 x Controller 1 x user manual (English language not 1 x Sensor Package List 1 x Controller 1 x User Manual 1 x Sensor