The Acu-Rite Wireless Weather Forcaster is designed to work for you! The display unit features outdoor temperature, indoor temperature, Weather Forcaster, How-to-Dress character (you can choose boy or girl icons) and indoor humidity. The Ourdoor Sensor has a LED indicator and integrated hanger. Requires 4" "AA" lithium batteries recommened in Outdoor sensor. Batteries not included. Stronger wireless signal than other brands! Wireless range 165ft. maximum distance.