Samcom Digital Wireless 10- Channel Intercom with Small Walkie Talkie for Home and Office Pack of 2 10-Channel Latest Version Instant Intercom system ; Effective distance Approx. 1000 feet Individually call and Group call function; Lock button (or monitor function) let you talk continuously 1 Hours Connect ability to other hand held two way radio Frequency Range: 462.6625 - 467.7125 (MHz) What's in the mailing box : * Main Station unit x 1 *Walkie Talkie X1 * Power adapter x 1 * USB Cable x 1