Sennheiser EW 500 Manual page 96

DC 1 DC power adaptor,
for external 12 V DC powering of SK/EK 500 (instead of 9 V PP3 battery)
Helical antenna for EK 500
A 17-1
for use with cameras
A 17-2
CC 1 Carrying case for SET 500
518 – 662 MHz
740 – 870 MHz
93