What's in the box:

Muslady UHF Wireless Microphone Mic System with Receiver Transmitter Clip-on Lapel Lavalier Microphone for Business Meeting Public Speech Classroom Teaching (1)

Features:
Wireless microphone system with 1 lapel clip-on microphone, 1 body pack transmitter and 1 mini receiver.
UHF wide band frequency, stable transmission and low distortion.
48 selected channels and 48 random ID, strong ability of anti-interference.
The receiver with 6.35mm(1/4") connector, you can connect it to your speakers or amplifiers easily.
Max. effective transmission range in open area is about 30 meters, suitable for public speech, classroom teaching, business meeting, etc.

Specifications:
--System
Frequency Bandwidth: 50MHz
Modulation: Broadband FM
Number of Channels: 48 channels
The Peak Frequency Deviation: 45KHz
Frequency Responses: 80Hz-15KHz
S/ N Ratio: 50dB
T.H.D. (Overall): 2%
Working Distance: 30m no obstacles
Working Temperature: -10?-55?

--Receiver
Sensitivity: 5dBuV
Spurious Suppression: >80dB
Audio Output: 1/4" unbalanced output 400mV/3KO
Power Supply: 2 * AAA Batteries(not included)
Receiver Size: 7 * 2.7 * 2.3cm / 2.8 * 1.1 * 0.9in
Receiver Weight: 29g / 1oz(without batteries)

--Transmitter
Transmitter Power: max. 30mW
Transmission Stability: <30ppm
Dynamic Range: 100dB(A)
Frequency Responses: 50Hz-15KHz
Sound Pressure: max. 130dB SPL
Power Supply: 2 * AA Batteries (Not Included)
Transmitter Size: 11 * 6 * 2cm /
Transmitter Weight: 63g / (without batteries)

Package Size: 29.5 * 13 * 6.5cm / 11.6 * 5.1 * 2.6in
Package Weight: 278g / 9.8oz

Package List:
1 * Microphone
1 * Receiver
1 * Transmitter
1 * Users' Manual(English)