Instruction books can be hard to find, so we hope you find this useful.
This is a copy of the SKM 825-XSW Sennheiser Dual Mics Operation Manual:
SKM 825-XSW Sennheiser Dual instructions
Sennheiser wireless microphones offer professional freedom, but they are sensitive instruments that require careful handling.
While these units are built for live performance, they are subject to the laws of radio frequency; walls, crowds, and other wireless gear can create signal dropouts if your line-of-sight is obstructed. The microphone capsules are delicate—impacts or drops can damage the internal diaphragm, instantly degrading your audio quality. Furthermore, these units rely entirely on consistent power; leaking batteries or improper storage can corrode internal contacts, rendering the hardware unusable. For a flawless performance, always perform a frequency scan before you start, ensure your batteries are fresh, and keep your transmitter and receiver within clear sight of one another. Wireless audio is a high-performance tool that rewards preparation and professional handling.