What's in the box:

UHF Dual Channels Wireless Microphone Mic System with 2 Bodypack Transmitter 2 Headset Microphones 1 Receiver 6.35mm Audio Cable Power Adapter for DJ Karaoke

Features:
Professional microphone system with UHF design(780-850MHz).
Transmitter: 2 body-packs with 2 headset microphones.
Receiver: ON/ OFF knob, 2 volume control knobs and RF/ PEAK indicators.
Two XLR balanced and one 1/4" audio mix output interfaces.
Up to 120m effective operating range in open area.

Specifications:
Frequency Range: 780 - 850MHz
Transmitter Power: 8.5mW
Frequency Deviation: 25KHz
Dynamic Range: 90dB
Frequency Responses: 40Hz-15KHz(3dB)
T.H.D. (Overall): 0.5 %
S/ N Ratio: > 90dB
Working Distance: Up to 120 meters if no obstacles
Cable Length: About 1 Meter
Transmitter Power Supply: 2 * 1.5V AA Battery (Not Included)
Receiver Power Supply: DC 12-15V
Power Adapter: US Plug
Receiver Size: 19 * 13.5 * 4cm / 7.5 * 5.3 * 1.6in
Receiver Weight: 290g / 10.3oz
Package Size: 45 * 29.5 * 7.5cm / 17.7 * 11.6 * 3in
Package Weight: 1.2kg / 2.6lb

Note:
The batteries for transmitters are not included.

Package List:
1 * Receiver
2 * Body-pack Transmitters
2 * Headset Microphones
1 * Audio Cable
1 * Power Adapter(US)
1 * User Manual(English)