Wireless Intercom System- MURS Long Range up to 4 Miles. Four Room Set. LONG RANGE wireless intercom system with up to a 4-mile range (range will be diminished by trees, hills, and buildings) PROFESSIONAL grade. Four base stations included but fully expandable to an UNLIMITED number of MURS intercoms. SUPER EASY SET UP. No pairing required, just turn to the desired channel. 5 channels and 38 sub-channels. LOUD adjustable volume and EXCELLENT sound quality. Compatible with all MURS radio frequency products.