The ECO wireless gong set includes a gong and a bell button, with 12 different melodies to choose from. Gong installation type: surface-mounted (wall, front door) or freely positionable (table, shop counter), bell button installation type: surface-mounted using a screw or adhesive strip, frequency band: 433.05-434.79 MHz, radio range: 50 meters in open space, volume: 80 dB at 1 meter, gong: power supply 2 x 1.5 V AA batteries (not included), gong: power supply 1 x 3 V battery (CR2032) included, frequency band: 433.05 - 434.79 MHz, RF power level: 10 mW, gong protection class: IP 20, bell button protection class: IP 44, parallel connection of several gongs not possible
