Battery Temperature Sensor (BTS) f/Freedom SW SeriesThe Battery Temperature Sensor (BTS) mounts on a terminal post of a battery in a bank or on the side of a battery and measures its temperature. It sends precise information to the charger or charge controller, 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 25 ft. (7.6m) communications cable Compatible Devices:Freedom SW 2000, 3000, 2000 24V, 3000 24VWARNING: This product can expose you to chemicals including Diisononyl Phthalate (DINP) which is known to the State of California to cause cancer, and Di-isodecyl Phthalate (DIDP) which is known to the State of California to cause reproductive harm. For more information go to P65Warnings.ca.gov.