The package contains 4 pieces of mini microphone, Cute, lightweight, and mini design, easy to carry(wiring length: 59.05 inches; Microphone length: 2.28 inches. Just plug and record anytime, anywhere without an external power supply; the mini microphone is lightweight, high quality, and easy to take along. It is just a mini-phone microphone(please check the size carefully before you place it, thank you.) it can be compatible with an earphone plug with 3.5mm of the smartphone Mini handheld condenser microphone for voice recording & internet chatting, phone calls Please note that the Android phone only listens to the song you sing after recording, and the phone of the IOS system can be listening while singing.