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Enhanced Battery Safety: The 12V BMS 4S provides protection from overcharging, overdischarging, overcurrent, short circuits, and high/low temperatures, ensuring the safety and longevity of your battery pack. 2-in-1 Bluetooth/Wi-Fi Dongle: Connect easily with the app via Bluetooth, or change to Wi-Fi for remote control when Bluetooth is out of range (requires connection to a Wi-Fi router). Remotely monitor battery status and modify parameters via the mobile app or PC software whether you're at home, on the road, or running a trolling motor. The integrated parallel circuit enables the parallel use of battery packs and 485/CAN Bus parallel communication, making it compatible with mainstream inverters on the market. Packing List: 4S 12V 100 amp Smart BMS (x1), B-P-Output Line (x1), 2-in-1 BT/Wi-Fi Dongle (x1), Sampling Cable (x1), NTC (x1), CAN/485 5-pin (x1), Manual (x1). Simple to install, contains all components required for setup and operation. Complies with ISO, FCC, RoHS, PSE, and CE standards