The Byron Smartware DB313 Wireless Plug-Through Door Chime has a 30 metre operating distance. It provides a single melody, ding dong chime, and operates using a fixed code.
Its plug-through feature means that there is no loss of socket. Another mains powered object can to be powered by plugging into the chime's socket. It also comes with a portable chime, that can be placed in a different room to the plug in chime.
It has a 80-85dB rating, depending on the sound. Compatible with all Byron DB ranges.
The plug in chime is mains powered.
The push requires 1 x 23A battery (included).
The portable chime requires 3 x AA batteries (NOT included).