Wireless Indoor Outdoor Thermometer with 100m Range: This wireless indoor outdoor thermometer receives readings from the included outdoor temperature sensor at up to 100 m (328 ft) in open areas. The remote thermometer helps you check outside temperatures from inside your home (Note: walls and obstacles may reduce the working range) Indoor Outdoor Thermometer with Clear Temperature Readings: This digital outdoor thermometer measures indoor temperatures from 0-50 °C (32-122 °F) and outdoor temperatures from -30-50 °C (-22-122 °F). The indoor outdoor thermometer provides ±1 °C (±2 °F) accuracy and lets you switch easily between °C and °F Outdoor Thermometer with MAX/MIN Memory: This outside thermometer records the highest and lowest temperature readings for easy reference. Press MAX/MIN to view the stored values, or press and hold the button to clear the data and begin a new monitoring period Easy-To-Read Remote Temperature Monitor: The LCD display shows indoor temperature, outside temperature, signal status, trend information and MAX/MIN indicators in one view. This room temperature monitor has a compact round main unit measuring approximately 9 x 9 x 2 cm, making it easy to place on a desk, shelf or bedside table Wireless Thermometer for Wall Or Tabletop Use: Use the hanging hole to mount this indoor thermometer on a wall, or unfold the stand for tabletop placement. Suitable for bedrooms, kitchens, living rooms and home offices. The main unit and outdoor temperature sensor each require 2 AAA batteries, 4 batteries in total (not included)