The easy, portable, plug-in way to communicate throughout your home or office. No installation is required. COMMAX personal intercoms allow family members to communicate with each other, room to room and between floors. All COMMAX intercoms are fully compatible with each other, so you can expand your system at any time. Just plug them into any electrical outlet, turn them on and talk
FAQ's

1. Does this require batteries to operate?
   No this is a plug and play device hence it does not require any batteries just plug it into any electrical socket and you are ready.
2. What is the range of the product?
   The range is 25-40 feet through walls etc.
3. How many units can be connected together ?
   You can connect 4 units together.
4. How many units do I get in this pack ?
   Each pack contains 2 units