1. Only suitable for headphone 3.5 mm Jack. 2. This is a unique voice change system designed to be compatible with most mobile phones and computers, especially Android and for iPhone. 3. When the headphone is connected, the system will automatically turn off. Just plug the earphone voice converter into the phone, put the microphone on your mouth and speak normally. 4. There are 4 voice conversion modes that can better disguise different voice pitch. 5. The earphone sends your voice in real time when you call, so that you can check the sound quality. 6. The design is portable, simple, powerful, and real partner dubbing. 7. Can be used for mobile live broadcasting, singing and recording, Wechat, QQ, telephone voice weird whole maggot chat, clear voice, voice change adjustment (male to female, female to male), with reverberation, KTV effect,with inflexion function, can switch a variety of voice mute function. Battery capacity: 400mAh Output power: 10mW Charging power: DC5V/1A Sensitivity: -44+/-3db (0db=1V/Pa, 1KHz) Distortion: THD Less than 1% Directivity: omnidirectional Pickup: capacitive colour:Black Gray/Rose Gold/Rose Red Material:Aluminum alloy size:13.7*4*2.4cm Package Contents: 1 * Microphone 1 * USB Cable