• SHENGFU TX-11 Vocal Radio Frequency Microphone.The Shengfu TX-11 Vocal Radio Frequency Handheld Dynamic Microphone with 3.5mm/6.5mm Rechargeable Receiver for Family Party microphone.Specification: 3. 74V/ 14650Siz lithium battery Audio frequency response Frequency stability Distortion degree: 0.5%Use time: about 10 hours.Packing box: 1USB charging cable 6.35mm conversion plugProduct parameters Frequency Range: 636-695. 7MFz RF power: 10dbmEach channel: 100 frequency pointsOscillation mode: DSP chip frequency lock battery.Packing list:Receiver: 1Transmitter: 1Manual: 1.