The ProLink 500 series provides high quality full duplex communication between four users anywhere. Battery powered and not tied down to any base station. You get 500 foot range line of sight. This easy to use wireless intercom system requires no installation and no training, just turn it on and talk.
PRO-540 Features:Made in the USAFull duplex communication between four users.No base station required12 hours of battery life on a full chargeTwo wireless channelsTwo wireless channels500 foot range line of sight