Cameron Sino 450mah Battery For Sennheiser Sdw 30,sdw 60,sdw 5066,sdw 5065, sdw 5064,sdw 5063,sdw 5036,5035,sdw Pro 1,sdw Pro 2 - Digital Batteries - AliExpress
Amazon.com: Sennheiser SDW 5064 (507012) - Double-Sided (Binaural) Wireless DECT Headset for Softphone/PC & Mobile Phone Connection Dual Microphone Ultra Noise Cancelling, Black : Electronics
User manual Sennheiser SDW 60 HS (English - 57 pages)