•【Universal 4-Channel Wireless System】Offers professional-grade audio freedom with four mono transmissions,perfect for seamless recording,shooting,and video production in various scenarios. •【360° Rotatable Clip】The wireless lavalier microphone features a 360° rotatable clip for easy attachment to clothing,providing hands-free operation. •【Long-Range Transmission】Ensures clear audio recording and video capture up to 650 feet (200 meters) in both indoor and outdoor settings. •【One-Click Noise Reduction】Easily control noise cancellation on the transmitter with a single button,capturing clear,detailed sound even in noisy environments. •【Extended Battery Life】Get up to 6 hours of working time on a full charge,with the compact charging case providing two additional full charges for a total of 18 hours of use. •【Plug-and-Play Compatibility】Compatible with iPhone 11-14 series (excluding for iPhone 15/16) and for iPads with 8-pin connectors,requiring no adapters,Bluetooth-compatible,or apps for setup. •【Uninterrupted Playback】Unique audio analysis technology allows for continuous playback through the phone's built-in speaker without unplugging the receiver. Specifications: •BY-V4-TX transmitter: •Transmission mode: 2.4 GHz •Signal modulation: Gaussian frequency shift keying •Polarity pattern: Omnidirectional •Antenna type: Ceramic antenna •Operation distance: 200 meters (obstacle-free) •RF output power: ≤10 dBm •Distortion: ≤0.1% •Frequency response: 20 Hz - 20 kHz •Sensitivity: -42 dB •Reference audio input level: -20 to -42 dBu (MIC input,0 dB gain) •Sampling rate: 48 kHz •Signal-to-noise ratio: 85 dB •Audio input: built-in microphone •Built-in battery capacity: 3.7V/95mAh •Power supply: built-in lithium battery •Battery life: about 6 hours •Charging time: about 2 hours •Weight: about 11g •Dimensions: 53.1 x 18.3 x 10.2 mm •Operating temperature: 0℃ to 50℃ •Storage temperature: -20℃ to 55℃ •BY-V4-RXD Receiver: •Transmission mode: 2.4 GHz •Signal modulation: GFSK •Polarity pattern: Omnidirectional •Antenna type: Ceramic antenna •Operation distance: Up to 200 meters (obstruction-free) •RF output power: ≤10 dBm •Distortion: ≤0.1% •Frequency response: 20 Hz - 20 kHz •Signal-to-noise ratio: 85 dB •Audio output: 8pin •Power supply: Powered by external device •Weight: 9g •Dimensions: 62.5 x 18.3 x 10.2 mm •Operating temperature: 0℃ to 50℃ •Storage temperature: -20℃ to 55℃ •BY-V4-CC charging box: •Battery type: built-in lithium battery •Built-in battery capacity: 3.7V/1500mAh •Charging time: about 2 hours •Power supply: USB-C charging port (DC 5 V/2 A) •Number of charging cycles: 1 time (4*TX+1*RX),2 times (4*TX) •Weight: about 160g •Dimensions: 143.6 x 35.5 x 80.5 mm •Operating temperature: 0℃ to 50℃ •Storage temperature: -20℃ to 55℃ Package included: •1 x Charging Box •4 x Transmitter •1 x Receiver •1 x USB-A/C Charger •1 x English Manual