Product Name: FULINDA  ST-307 UHF Dual Channel Wireless Microphone
Model : ST-307
Brand Name: FULINDA 
Warranty: 12 Month

ST-307 One for two wireless microphone
Features:
High stability/durability tube structure developed and designed for KTV venues.
Dual-channel UHF wireless system with 100 optional frequencies per channel.
The backlit LED display indicates RF and AF signal strength, battery status, diversity channel indication (A/B), frequency, frequency group/channel and other working status.
Digital audio code locking technology is adopted to effectively block the noise interference in the use environment.
Using the latest infrared automatic frequency (IR) technology, the setting and operation are easier.
2 microphones can be used interchangeably, with strong versatility, all-metal plating tube body, strong, anti-drop, wear-resistant.

Comprehensive parameters:
Frequency range:  640MHz-690MHz
Number of channels: 200
Channel spacing: 300KHZ
Frequency Stability: ±0.005%
Dynamic range: 100db
Maximum offset: ±45KHZ
Audio frequency response: 40HZ-18KHZ (±2db)
Comprehensive signal-to-noise ratio: >105db
Distortion: =0.5%

Receiver:
MF: 110MHZ. 10.7MHZ
Antenna Access: TNC/50O
Sensitivity: 12dBuV (80db S/N)
Sensitivity adjustment range: 12-32dBuV
Spurious Rejection: =75db
Maximum output level: +10dbv
Power: 12V 400mA

Transmitter:
Output power: high power 30MW, low power 3MW
Audio frequency response: 40~18,000Hz, (+1 dB, -3 dB). 
Spurious Rejection: -60db
Power: 2 x AA batteries
Effective Range: 55m (depends on premise's conditions)