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 durable. 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-18KHz3DB 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.