ELPA wireless intercom with a 100m communication range, a set of two. Conveniently allows simultaneous communication with up to 4 units when expanded. - Brand: ELPA - Model: WP-5150SET - Function: Wireless Intercom - Communication Range: 100m - Simultaneous Calls: Up to 4 units - Included: Charging stand, AC adapter, instruction manual Please check the manufacturer's website for details. Thank you for viewing. Used only for test operation. Works without any problems, but I am selling it because I no longer need it. All accessories are included.