BGWORLD Replacement Ear Pads earpads Foam Cushions earmuff For Sennheiser MM 400 X 450 Wireless Headset sponge headphones part - AliExpress Consumer Electronics
Sennheiser MKE 400 - - Highly directional on-camera shotgun microphone with integrated features to enhance dialogue and in-camera audio.
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Sennheiser MM 400-X review | What Hi-Fi?
Amazon.com: Replacement Battery for SENNHEISER 450 Travel 550 Travel MM 400 MM 400-X MM 450 MM 450-X MM 500-X MM 550 MM-550-X PCX 360 BT PX 210 BT PX 310 BT PX
Sennheiser MM400 Bluetooth Stereo Headphones - Review | GearDiary
Sennheiser MM 400-X / MM 400 Reviews - alaTest.com
User manual Sennheiser MM 400-X (English - 29 pages)