Check the listing for details. Toro Rain Freeze Sensor/Rain Sensor Wireless TWRFS (Controller Only). Condition: Used. Listed at 9.96 USD. The Toro Rain Freeze Sensor is a wireless controller designed for lawn irrigation systems. Specifically designed by Toro, this model is suitable for outdoor use and is ideal for automating your watering needs. With its rain sensor capabilities, it ensures that your lawn is watered only when necessary, making it an efficient and convenient solution for maintaining a healthy garden or lawn.