Signolux Tower System & Landline Telephone Transmitter comes supplied with rechargeable batteries and also a mains power supply as standard. This product was designed product for people with hearing problems and informs about domestic events with a bright 360° flashing light, LED display of the event symbols and powerful tones, the volume of which can be adjusted. An optional vibrating pad can slip under the user's pillow or mattress sheet and they will be alerted by strong vibration patterns The Signolux Tower receiver offers a choice of 16-tone sequences or melodies for acoustic alerting. These can be individually assigned to the respective events. About the size of a beverage can, self-standing and mains-independent, the Signolux Tower Receiver can be placed at different locations in the home. All Humantechnik alerting modules can be connected via the AUX socket on its back, for example, the vibrating pad, flash module, or extra sound module This system is made up of three parts, a Signolux bellpush and a Signolux Tower receiver, and a Signolux telephone Transmitter.  This system is also fully compatible with all older Signolux transmitters The telephone transmitter can be plugged into any telephone socket or modem socket(Digital Voice) in your house and when the phone rings it will send a wireless signal to the Signolux Visual Alert Receiver which will then indicate the telephone symbol, will ring like a very loud telephone and also flash. What's in the box? Signolux Door Bellpush.Signolux Tower receiverSignolux Telephone transmitter directAll Batteries.Mains power supply for tower receiver