Wireless Door bell38 melodies and 4 volumes: The Sonnette receiver has 38 carillons and 4 adjustable volume levels (0 dB to 110 dB) to meet your needs for different occasions. The LED sightings are suitable for elderly and mentally ill people. Music and volume level aprs a current pan, no need to initialize your parameters procdents.energy economy and tank IP55: meter without wireless power on a battery 12 V 23 A. It can support plus de 100 000 clicks, a la plus longer life span of 3 years. Resist diverse meteorological conditions difficult (functioning between -20 C and 125 C). Port of 300 m: the signal of the sonnet without filament can easily traverse the doors or the metal walls, guaranteeing that you will never miss a visitor, if you These in some pieces or on another day. Remarque: The level of the battery will affect the range of signal reception. It is recommended to change it once every 12 months.Multi-usage: the sonnette sans fil is suitable for the house, the apartment, the classroom, the office, etc. You can use our sonnets to dress dogs, use them to calm classrooms, elderly people and handicapped people, use them as alerts, double assists, and more encore.