ELPA DECT Wireless Intercom WIP-5150SET Parent and Child Unit Set No construction required, no wiring needed. Product Details of WIP-5150SET ● Two-way communication possible. ● Can call everyone at once. ● No wiring required. Rechargeable, so it can be carried and used. ● Up to 4 units can be connected. * As shown in the photo, the staples on one part of the package are coming loose. Thank you for viewing.