【4-Channel Wireless System】Offers professional-grade audio freedom with four mono transmissions, ideal for seamless recording and video production in various scenarios. 【360° Rotatable Clip】Features a versatile clip for easy attachment to clothing, providing hands-free operation for convenience. 【Long-Range Transmission】Ensures clear audio capture up to 650 feet (200 meters) in both indoor and outdoor settings. 【One-Button Noise Reduction】Easily control noise cancellation on the transmitter, capturing clear, detailed sound even in noisy environments. 【Extended Battery Life】Enjoy up to 6 hours of operation on a single charge, with the charging case providing two additional full charges for a total of 18 hours of use. 【Plug-and-Play Compatibility】Supports 3.5mm interface digital cameras/DSLR/camcorder/voce recorder devices. 【Real-Time Monitoring】Unique audio analysis technology allows for uninterrupted playback through your device'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: 3.7 V/95mAh Power supply: built-in lithium battery Battery life: about 6 hours Charging time: about 2 hours Weight: about 11 g Dimensions: 53.1 x 18.3 x 10.2 mm Operating temperature: 0℃ to 50℃ Storage temperature: -20℃ to 55℃ BY-V4-RX 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 Battery capacity: 260mAh Battery life: 2 TX mode about 10 hours; 4 TX mode about 6 hours Charging time: about 2 hours Audio output: 3.5 mm TRS Power supply: built-in lithium battery Power supply weight: 16 g Dimensions: 62.5 x 29.4 x 13.5 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 160 g Dimensions: 143.6 x 35.5 x 80.5 mm Operating temperature: 0℃ to 50℃ Storage temperature: -20℃ to 55℃