Galaxy Audio AS-1210R Wireless Bodypack Receiver with EB10 Earbuds (D: 584 to 607 MHz)Key Features For Musicians and Performers For Use with AS 1200 Wireless System Requires AS 1200T Transmitter Dual Balanced Armature Driver Monitors 210 User Selectable UHF Frequencies Runs 5 Hours on AA Batteries 300' Range The Galaxy Audio AS 1200R Wireless Bodypack Receiver with EB10 Earbuds works with the AS 1200T transmitter (available separately) to provide wireless onstage monitoring for musicians and performers at a maximum distance of 300'.