Feature:     1. W  ith a clip that clips onto your collar, then plug the receiver port into your device and it will automatically connect. Plug and play, no APP or Bluetooth required.      2. With a built in professional grade intelligent active noise cancellation chip; hifi sound quality, deep restoration of the original sound; dual diaphragm 360 degree surround sound pickup, accurate catch of sound details.      3. Can cover 666 feet with 0.009 seconds transmission delay, helping you reduce power failure and record or shoot video clearly from a distance.       4. Compatible with mainstream devices on the market, supporting 99 percent of cell phones, computers, sound cards, cameras, camcorders, perfectly compatible for Android and for IOS systems.             Specification:             Item Type: Wireless Lavalier Microphone  Material: Plastic, Electronics  Input Voltage: 5V   Continuity: 10 Hours   SNR: 64dbm 3 Step Noise Reduction   Transmission Delay: 30ms   Sensitivity: -42db   Frequency Response Range: 20-20KHZ   Transmission Distance: 20m/65.6ft Without Obstacles  Battery Type: Built in 60mAh x 2 (Microphone) Lithium Ion Battery (included)                    Package List:      2 x Microphone      1 x Receiver      1 x Charging Cable      1 x Manual