Walkers Sage Green Razor Muff Fde Logo . It has two hi-gain omnidirectional microphones low noise/frequency tuning and sound activated compression. The muff also utilizes a recessed volume control knob and audio input jack. Specifications for Walker's GWP-RSEM-SGN Razor Slim Electronic Muff 23 DB Over The Head Polymer Sag: Manufacturer: Walkers Fabric/Material: Polymer Additional Features: 23 dB NRR Walker's GWP-RSEM-SGN Razor Slim Electronic Muff 23 DB Over The Head Polymer Sag