Features: Indoor temperature (°F or °C) Remote temperature (°F or °C) Remote humidity (%) with calibration One WH-2C remote wireless included with LCD display Free standing or wall mount Min. and max. memory Manual set time 12 or 24 hour time mode Synchronized instant reception Low power consumption (over 2 years battery life for both base station and remote sensor) Supports up to three remote sensor channels (see below) Specifications: Humidity range: 1% - 99% (+/-5%) with Humidity Calibration Remote temperature range: -40°F to +149°F Indoor temperature range: 32°F to +140°F Temperature accuracy: +/-2.0°F Power requirements: Base station: 2 x "AA" alkaline batteries (not included) Sensor : 2 x "AAA" alkaline batteries (not included) Transmission frequency: 433MHz Transmission range: up to 300 feet open air (ideal conditions), 100 feet for most applications