Microphone and Rechargeable Receiver: Both the microphone and earpiece are rechargeable, consume no alkaline batteries, do not need to be connected to a power source, and can be taken anywhere without a mat. Automatic connection: The microphone and receiver can quickly and automatically connect within a distance of 80m, no manual settings are required, and it is very convenient to use. Free FM: Optional UHF frequency, not susceptible to interference from electrical appliances, stable signal transmission, multiple devices working together without interfering with each other. Easy to carry: The microphone and earpiece are made of metal, which is more sturdy and . Also because of its small size, it is easy to carry, you can put it in your pocket and carry it with you. Wide range of application: suitable for home, recording, interviews, outdoor performances, concerts, exhibitions, parties, conferences, churches, etc. Transmitter auto-sync: This device has auto-sync feature so you may have difficulty using multiple devices of this model at the same time Name: Headphone Wireless Microphone Type: 1 to 2 Frequency range: 500MHz-930MHz Debug mode, Dqpfsk Frequency response: 30Hz-18KHz±3DB Preset frequency points: 25 (automatic pairing) Signal-to-noise ratio: 96DB Using distance: 30-80M Battery specifications: built-in lithium battery Size: 65x52x16mm Receiver size: 65x31x20mm Colour:gray+black Material:Metal Package Contents: 2 x Receiver 1 x Transmitter 2 x Headset Microphone 2 x Lvalier Microphone 1 x USB Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.