This is a wireless intercom from ELPA (Asahi Denki) that requires no wiring and can be used immediately upon arrival. ■ Product Features No troublesome wiring required!: Wireless (DECT method) so you can carry it anywhere in the house. Two-way communication is possible: You can talk simultaneously like a telephone, allowing for smooth conversations. Rechargeable and economical: Both the master unit and the slave unit can be placed on the charging stand. No need to replace batteries. Up to 4 units can be connected: You can add more units and use them to call and talk in each room. ■ Recommended for those who: Have rooms where the doorbell is difficult to hear Need an indoor call system for elderly family members (as a substitute for a nurse call) Need to communicate between a two-story house or a detached building ■ Product Condition Condition: New, unused (unopened) Model number: WIP-50 JAN code: 4901087217908 ■ About Shipping Carefully packed with cushioning material (bubble wrap) and shipped quickly via Mercari delivery (anonymous shipping).