Grower's Edge Wireless Remote Sensor-----Large screen digital readout. Wireless sensor transmits up to 50 feet. Expandable to accept 2 additional sensors. Waterproof casing is chemical and UV resistant. Displays degrees in °F or °C. Wireless Sensor - For use with Grower's Edge® Digital Thermometer & Hygrometer #716555. Transmits up to 50 feet. 2 AAA batteries included.