The Signolux Portable Receiver is a portable vibrating pager unit that will alert you through both lights and vibrations. It can be carried anywhere in your home and can also be used at night time when used in conjunction with an external vibrating pad (sold separately) The Signolux Portable Vibrating Pager unit will alert you through both lights and vibrations. It can be carried anywhere in your home and can also be used at night time when used in conjunction with an external vibrating pad (sold separately). An optional charging cradle is also available to purchase separately. For each transmitter (purchased separately), you can choose from 6 differently coloured visual icons. There are different vibration sequences to differentiate between different signals. This pager is battery powered and can be used with either alkaline or rechargeable batteries. It is supplied with two alkaline batteries. However, for the most convenient use we recommend using rechargeable batteries and the docking/charging cradle (purchased separately).