Features :

- Modern and stylish design

- 58 selectable ringtones

- 5-level adjustable volume (include mute)

- Super long operation range

- Easy to install and use

- Easy to add additional transmitters or receivers

- Low power consumption

Specification :

Input of Receiver               : AC 110-220V, 50/60Hz

Battery in Transmitter      : 12V 23A Alkaline Battery

Optional Melodies            : 58

Volume Level                    : 0-110dB, 5 levels

Plug Type                          : UK standard plug

Wireless Distance            : up to 300m in open air

Expandable(Yes or No)    : Yes

Working Frequency          : 433MHz±2MHz

Working Temperature      : -20~ +50°C