Features: brand new and high quality This is a mini wireless transceiver system, for 6.35mm audio interface equipment, and has the advantages of strong anti-interference ability, strong penetration of obstacles, and stable transmission without freezing. Wireless devices can use up to 99 sets of devices simultaneously without interfering with each other. The transmitter of a wireless system can be used with the receivers of dozens of wireless systems. Wireless transmitter & receiver set for electro musical instruments such as guitar, , etc. giving you the best music sound.Transmission range is up to 50 meters. Built-in rechargeable lithium battery, long working hours; and comes with USB cable for simple charging. Specifications: Material: ABS Audio Response Range: 20-20kHz Channel: 99 channel Distortion: Less Than 0.05% Receiving Sensitivity: Less Than -110dbm @ 20dbsinad Signal to Noise Ratio : More than 85dB Transmitting Range: Max.50M (No Obstacle); 30M (through-wall) Transmission Delay: Less Than 2ms Power Supply: Built-in rechargeable lithium battery Charge Port: USB Note: The item does not contain oil. Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Transmitter, 1 x Receiver, 1 x User Manual, 1 x USB Charging Cable.