BOYA BY-V4 4-Channel Mini Wireless Microphone (3.5mm) 

• Supports up to 4 mics recording simultaneously; Automatic pairing for plug-and-play.
  
  
• Dual noise cancellation: BOYA Audio's one-click noise cancellation tech and windshield for clear sound capture in noisy environments.
  
  
• The TX features a rotating clip and an omnidirectional in-built capsule, enabling sound pickup at 360°.
  
  
• SNR 80dB and 48 kHz 16-bit recording for better-than-CD audio recording. 120dB SPL for avoiding distortion and clipping.
  
  
• 2.4GHz digital frequency with up to 200m transmission range in open space.
  
  
• Portable charging case with battery life of up to 18 hours for the UC/DI versions, and up to 12 hours for the RX3.5 version.