Xtech - Microphone Wireless UHF with Rechargeable Receiver works with 35mm or 1/4in Jack up to 82ft Range - Black

Specifications

Microphone

• Polar pattern:  Bidirectional 
• Frequency band:  U Band
• Frequency response:   50Hz-18KHz
• Distortion:  ?0.3%
• Sensitivity (1KHz):   -52.5±1dB/mW
• Maximum sound pressure level:   120db 
• Output power:  0.45W
• Switch:  On/Off
• Number of channels:  10 channel auto detection 
• Microphone power:  2 AA batteries (not included)
• Cover material:   ABS

Receiver

• Connection type:  U band wireless transmission
• Battery Type:   1200mAh 18650 Li-ion Battery
• Input voltage:  5VDC, 1A
• Battery capacity:  3.7VDC, 1200mAh
• Operating hours:  Up to 7 hours
• Charging time:  2-3 hours
• Wireless frequency:  A: 750-759MHZ(750) Frequency range: 1MHZ
• RF Wireless Range:   Up to 25m**
• Sensitivity
• Switch:  20mV

Specifications 

• Applications:   On/Off Supports all devices compatible with a ¼in or 3.5mm microphone input port, such as karaoke machines, party speakers, audio amplifiers, PA systems, etc.*  
• Dimensions:  23x4.9x4.9cm
• Weight:   0.33kg
• Cable length:  Micro USB charging cable: 1.2m