The Link2Home Smart Alarm Gateway & Internal Siren supports the monitored alarm system and can also act as a door chime. Brightness, volume (Max. 95dB) and duration can be adjusted to your preference. It has up to 80m open field Zigbee transmission (3.0) and requires a WiFi connection. Mains powered 5V 1A, adaptor included.  Specification: Transmission Range: 80mFixing: Floor/shelf standing Ref: UTTK880