This wireless door sensor alarm includes 1 receiver and 2 sensors, with a 656 ft / 200 m range in open areas and 164 ft / 50 m through walls. It offers 58 ringtones, 5 volume levels (0-110 dB), and LED indicators. Easy installation with strong adhesive, and battery lasts over a year. Ideal for home, store, or security needs. | Vevor | | Door Chime, DC 12V, Wireless Door Open Contact Sensor Alarm Chime with 656 ft Range, 58 Chimes & 5 Adjustable Volume | White | Best Buy