Magnum ME-BTS-25, Remote Temperature Sensor, 25 FeetCondition:* New Surplus Stock, No OEM Packaging. As Pictured.Additional Notes:* The Magnum ME-BTS-25 Battery Temperature Sensor (BTS) provides the Magnum Inverter/Chargers with precise battery temperature information to automatically adjust the Absorb and Float charge voltage set points. * This allows the batteries to be correctly charged under extreme temperature changes.* If the temperature sensor is not installed and the batteries are subjected to large temperature changes, battery life may be shortened.* Compatible Models: ME Series MM Series MMS Series MS Series MS-PAE Series MSH Series RD SeriesMagnum ME-BTS-25