Sennheiser MB Pro 1 UC ML (506043) - Single-Sided, Dual-Connectivity, Wireless Bluetooth Headset | For Desk/Mobile Phone & Softphone/PC Connection| w/ HD Sound & Skype for Business Certified (Black) - Walmart.com
Sennheiser MB PRO 1 Wireless Headset Battery (Li-Pol 3.7V 200mAh) - Replacement For Sennheiser 504374 , DW PRO 1 and PRO 2 Wireless Headset Batteries - Walmart.com
User manual Sennheiser MB Pro 2 (English - 30 pages)