Uni-Com Portable Door Chime - Set of 2 This handy door chime is designed with wireless technology, so it doesn't need to be fixed into one position - great if you have difficulty hearing and need to keep the bell close by. With a working distance of up to 120m, you can even carry it down to the garden so you never miss a visitor. When the button is pressed, it will play a melody and show a red LED light. 8 selectable melodies Operating distance up to 120m Each chime can be connected to up to 4 door pushes Up to 1 year battery life (or 20,000 bell presses) 85dB sound output Dimensions: H9.8 x W7 x D3.7cm Colour: White