Transmitting range: about 3m (depends on type of operation). This is a high-performance product available at low wholesale prices.China manufacturer specifications:main unit.Fm110mhz (when wireless earphone is used).Modulation type: fm.Transmitting range: about 3m (depends on type of operation).Power supply: dc12-24v, 300ma.Receiving wireless earphone.Receiving frequency: fm110mhz.Output: 0.6Mw, 200hz-6khz.Manufacturer and origin: china.