Digital Thermometer and Hygrometer Indoor Humidity with 3 Sensor HTN Screen Display White Backlit Temperature Humidity Monitor with 500ft Range Wireless Transmission Features: 3 Sensors: Digital thermometer comes with 3 sensors which can monitor 4 different places simultaneously(3 sensor+indoor). Convenient for you to control the humidity and temperature of different room and place. Multifunctional: This temperature thermometer ensuring that you receive the most reliable information as humidity, temperature. Besides, it is support temperature alert, max/min record and trend arrows, easy for use and check. Wireless Transmission: The thermometer and outdoor sensor via wireless information transmission, up to 150m/500 feet far transmission distance(in open air), suitable for home, school, store and industry. Colorful Screen Display: The hygrometer and thermometer for home with large HTN display screen and white backlit, which shows comprehensive information, easy for you to view anytime. Standable and Hangable: Digital thermometer receiver designed with a hidden stand and a hanging hole, suitable for place on desktop, countertop, hanging on wall and door. Less limit for installation. Specification: Color: White Power:  3*AAA Battery for Receiver(batteries are not include) 2*AA Battery for each sensor(batteries are not include) Receiver Size: 87*105*24.5mm/3.4*4.1*0.9in Sensor Size: 50*105*29mm/1.9*4.1*1.1in Screen Size: 58*76mm/2.3*2.9in Packing List: 1 * Receiver 3 * Sensors 1 * Manual