Features:
100% Brand new and high quality!
UHF frequency band (780-789MHz)and PLL frequency synthesized technology for stable working performance 
3 selectable channels (UPGRADED)
Powered by 2pcs AA batteries(NOT included)， low power consumption design for long playtime up to 30 hours 
Multiple sets of receivers can be operated with a single transmitter within the operating range 
Dynamic expansion circuitry for high S/N ratio 
Complex anti-interference circuit for using 3sets at the same time without mutual interference 
Small size for easy carry， and say goodbye to heavy monitor system ，Unlike most traditional heavy stage audio system.
It supports independent microphone input and an external audio source such as CD， MP3，Cellphone;

Specification:
Condition: brand new
Carrier frequency: 780 MHZ to 789 MHZ
Frequency response: 30 hz - 16 KHZ
Channel: 3
Transmission power: < 10 DBM
Signal to noise ratio: > 50 db
Transmission distance: > 50 m
The stereo separation degree: > 45 db
Transmitter power: DC12 v / 300 mA
Receiver power supply: 2 x 1.5 v / 1.2 v AA alkaline batteries rechargeable batteries

Packing content:
1 x Transmitter
1 x Receiver 
1 x Audio cable
1 x Earphone
4 x Earphone Foam
1 x Power adapter