Things you need to pay attention to! 
For smart phone with IOS system(iPhones), this Mic works well either in Audio or Video mode.When used with the iPhone 7 or above, you need to use the original adapter cable; 
For the smartphones with Android system, we suggest you need to dowmload the 3rd party APP for use. For example "DU Recorder" "Mobizen Screen Recorder" "ilos Screen Recorder" and other video apps; 
To avoid signal interference during usage, please set the phone to flight mode; The working distance will be affected by the surrounding environment.In the process, please try to make sure the environment is barrier-free and turn off the WIFI of your smartphone; 
Incompatible phone models: GOOGLE PIXEL; 
During usage, the receiver should not be close to other UHF transmitters, radio stations and other devices which may cause interference.

Specifications : 
Group A Wireless 
Frequency:568.125.000MHz~579.125MHz. 
Group B Wireless Frequency:580.125MHz~591.125MHz 
Powered: 3 AAA Batteries or External power 
AntennaBuilt-in Spring Antenna 
Sound Delay:﹤20ms 
Audio Distortion:﹤0.5% 
Signal/ Noise:﹥65dB 
Audio Input Socket: 3.5mm jack 
Dimension: 4.09×2.46×0.7in

Features: 
Built-in Smartphone Holder design 
Real-time Monitor 
Easy-to-read LED screen 
1/4 External Port 
“Line in”function 
1-Triggered-2, Universal for Smartphone & Camera 
Built-in Antenna, Mini and Compact, Working Distance Up to 60m （60m in open area , 30m in area with obstacle）