I have MM 100's since 2014, 10/10 condition. With charger but i lost the box and invoice. How much can i sell this for? A collector friend said second hands starts from
Amazon.com: Sennheiser MM 550-X Wireless Bluetooth Travel Headphones : Electronics
Amazon.com: Massdrop x Sennheiser PC37X Gaming Headset — Noise-Cancelling Microphone with Over-Ear Open-Back Design, 10 ft Detachable Cable, and Velour Earpads,Black : Electronics
Sennheiser D 10 USB ML - US (506418) Single-Sided Wireless DECT Headset, with Direct Softphone Connection, Noise Cancelling Microphone, and is Skype for Business Certified (Black)
EPOS/Sennheiser EDU 10 Stereo Headset (30 Pack) - Global Teck
Sennheiser MM10 Stereo Headset Earbuds Earphones for Mobile Phones 615104118379 | eBay
Sennheiser Black MM 400-X On-Ear Foldable Bluetooth Phone Headset - Newegg.com
EPOS/Sennheiser EDU 10 Stereo Headset (30 Pack) - Global Teck
Sennheiser EW-DX | Digital Wireless Microphone System | Pro Audio
SENNHEISER MM10 Earbud Headset - Newegg.com
Sennheiser Jack Plug Compatible Replacement 3.5mm Stereo Locking Jack Plug x 10 | eBay
Sennheiser HD 206 Closed-Back Over Ear Headphones 3.5mm Wired Stereo Music Headset Noise Isolation Earphone - Walmart.com