Multi-functional station shows you temperature and humidity indoors, as well as up to 3 additional rooms. Displays a smiley face for comfortable room climate (within +66.2°F to 77°F and 40 to 60% range) or frowny face, if at uncomfortable levels inside your home. Writable display (pencil only) to identify each room you're monitoring from a storage room, basement, garage or other source. From the garage to the attic, let the wireless technology leave you in comfort knowing room conditions elsewhere. Battery operation and offers a wireless range over 330ft (100m) from included transmitting sensors. | La Crosse Technology | | 3-Channel Wireless Digital Weather Station with 3 included transmitting sensors | Black/Gray | Best Buy