Fangrui Product Details Smallest Size, Easiest To Control Headset. 2.4g Wireless Technology, Low Latency, No Compression; Support Connecting To Mobile Phone For Feedback Stereo, Plug And Play. Suitable For Wireless Monitoring System For Stage Performers And Performers, Providing Higher Quality Sound Feedback. Sampling Rate: 24bit/48khz Lossless Digital Transmission Wireless Frequency Range: 2.4ghz Delay: Less Than Equal 12ms Effective Distance: Less Than Equal 30 Meters Outdoor Distance Or 15 Meters Wall Distance Power Supply: Built-in Lithium Battery Can Be By Usb In 10 Hours Charging Device: Usb Charging Cable Supports Fast Charging Signal-to-noise Ratio: -98db Dynamic Range: 105db Frequency Response: 20-20k Hz, +1db/-3db Colour:black Material:plastic Package Contents: 1x Transmitter 1x Receiver 1x Usb Cable 1x 6.35 Audio Converter 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 Thi