VOCOPRO Digital Receiver and TRANSMITER24 bit digital, dual frequency (True stereo) transmitter and receiverUp to 9 sets are designed to work together without interferenceOperating in the 900MHz range, free of TV broadcast and Wi-Fi interferenceRugged, rechargeable all metal body-pack receiver will work with most headphones (each receiver includes ie-9 in-ear headphones)Battery: built-in lithium ion 3. 7V 1380mAh (quantity 2 per body pack receiver)
