The Byron BY202 wireless door chime has a 100 metre operating distance with an 85db rating. It provides a choice of six melodies and has volume control. Self-learning codes will keep the code even when the batteries run out and are replaced. This portable/plug in door chime can have up to 6 bell pushes controlling the chime.
The Chime requires 3 x AA batteries (NOT included). The Push requires 1 x 23A battery (included).