Although it can charge and produce communication sounds, the sound cuts out severely, so I am selling it cheaply as junk. It works normally with other transmitters, so the receiver seems to be fine. I believe the error is with the transmitter. I recently purchased this item on a flea market site in "power-on only confirmed" condition. Due to this condition, please only purchase if you agree to no returns and no claims. [Included Items] Transmitter, receiver, box, charging cable, instruction manual, blank warranty card ・Wireless communication format: BOSS proprietary digital audio ・Wireless carrier frequency: 2.4GHz ・Maximum simultaneous channels: 14 (varies depending on the usage environment) ・Transmission range: 15m line of sight (varies depending on the usage environment) ・Latency: 2.3ms ・Dynamic range: 110dB or more ・Frequency response: 20Hz ～ 20kHz ・Nominal output level: -10dBu ・Output impedance: 1k Ω ・Recommended load impedance: 10k Ω or more ・Indicators: POWER indicator (also for battery check) RECEIVE indicator ・Connectors Output terminal: TRS standard type TRANSMITTER terminal: TRS standard type DC IN 5V terminal: USB Micro-B type ・Power supply: Rechargeable lithium-ion battery (obtained from DC IN 5V terminal) ・Current consumption Wireless operation: 60mA Charging: 500mA ・Battery charging time Receiver only: Approximately 3 hours Charging transmitter and receiver simultaneously: Approximately 4 hours ・Continuous battery life: Approximately 7 hours ・Dimensions: 87 (W) x 25 (D) x 38 (H) mm ・Weight: 60g