BOYA Magic 4 In 1 Flexible Wireless Lapel Microphone Live Streaming With Noise Reduction Interviews Desktop Mic Transmitter: 1. Transmission method: 2.4GHz digital band 2. Transmission distance: 100m (unobstructed), 10m (obstructed) 3. Microphone polar pattern: omnidirectional 4. Signal modulation: GFSK 5. Antenna type: LDS 6. RF output power: <10 dBm 7. Distortion: ≤0.1% 8. Frequency response: 20 Hz to 20 kHz 9. Sensitivity: -33.5 dB 10. Reference audio input level: -20 to -42 dBu (MIC input, 0dB gain) 11. Sampling rate: 48kHz 12. Bit depth: 24-bit 13. Signal-to-noise ratio: ≥80 dB 14. Audio input: built-in condenser microphone 15. Maximum sound pressure level: ≥115 dB 16. Power supply: built-in lithium battery 17. Battery capacity: 90mAh 18. Battery life: about 6 hours 19. Charging time: about 2 hours 20. Chargingoperating temperature: 0 to 45 degree Celsius 21. Storage temperature: -20 to 55 degree Celsius 22. Weight: about 7g 23. Size: about 35 x 15.2 x 13mm Charging case: 1. Battery capacity: 500mAh 2. Charging time: about 2 hours (5V 2A) 3. Charging port: Type-C 4. Charge cycles: over 1.5 times (2 x transmitters) 5. Weight: about 62.5g 6. Size: about 14.13 x 2.65 x 2.1cm Type-C8-Pin receiver: 1. Antenna type: ceramic antenna 2. Power supply: powered by external device 3. Weight: about 5g 4. Size: about 19.55 x 24 x 21mm 3.5mm TRS receiver: 1. Antenna type: ceramic antenna 2. Audio output: 3.5mm TRS analog output 3. Power supply: built-in lithium battery 4. Battery capacity: 200mAh 5. Weight: about 16g 6. Size: about 42.2 x 30 x 19.4mm Features: 1. Wireless lapel mic: transmitter features 13mm ultra-thin design that hugs clothing, weighing only 7g. works with phone receiver for instant recording. 2. Handheld interview pen: bar-shaped charging case doubles as handheld mic. No assembly or cables needed. built-in button controls transmitter power directly from the case without removal. 3. Wireless desktop