Sennheiser RS 4200 user manual (English - 89 pages)
Sennheiser RR 4200 Battery
CELLONIC - 2 x Premium Headphones Batteries Compatible with Sennheiser RS 4200 RR 4200 RR 840 RI 410 is 410 HDI 830, Set 840 TV Set 840-S Set 900 Set 830, BA300, BA 300 150mAh Replacement : Amazon.com.be: Electronics
Sennheiser RS 4200-2 II user manual (English - 23 pages)