Battery Temperature Sensor (BTS) for Freedom 458 SeriesThe Battery Temperature Sensor (BTS) is a replacement BTS designed for the Freedom 458 inverter/charger series. The sensor has a 15 foot cable attached and it mounts on a terminal post of a battery in a bank or on the side of a battery. It measures the temperate, which automatically adjusts voltage to help ensure full battery charge depending on the ambient temperature of your battery installation. Features: Gives charger proper temperature compensated charging 15 ft (4.6 m) communications cable Compatible Devices:Freedom 458 Series