The HED 040 Dual Ear Muff Hearing Protector Headphones from Williams Sound are compatible with receivers that have 3.5mm stereo jacks only. The Dual Ear Muff Headphones have a mild and low gain hearing loss rating. These full-size closed headphones are ideal for use in high-noise environments. 
 
 The HED 040 is recommended for Williams Sound PPA R37, PPA R38 FM receivers and WIR RX 22-4 IR receiver. It is not compatible with the Williams Sound PPA R35-8 receiver. 
         In the Box
   Williams Sound HED 040 Dual Ear Muff Hearing Protector Headphones
               | Frequency Range |  200 Hz - 6 kHz |  
  | Impedance |  32 ? nominal |  
  | Noise Reduction |  24 dB |  
  | Stereo Plug |  1/8" (3.5 mm) |  
  | Cable Length |  39" (99 cm) |  
  | Weight |  0.85 lb (387 g) |  
  
    |  Packaging Info  |  
  | Package Weight |  0.89 lb |  
  | Box Dimensions (LxWxH) |  8.25 x 5.75 x 4.25" |  
  
          All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.