Ideal as a doorbell, intercom, or personal alarm system, this device is useful for households, restaurants, hotels, businesses, or individuals in need of care. No installation of a bell is required, and it features a helpful visual ringing signal as well as an on/off switch. The wireless transmission frequency is 433 MHz with an operating range of 100 meters in open areas. It has 756 factory-set codes that cannot be changed by the user. Please note that the button is not suitable for operation in changing weather conditions. It has an IP rating of 20 and offers 36 selectable tones (polyphonic ringtones) with a maximum volume of 85 dB and an 8-level volume control.