Sennheiser AVX-835 SET Digital Camera-Mount Wireless Cardioid Handheld Microphone System (1.9 GHz) (2 Set) for interview. (+ XTRAS) I paid $1800 for two sets of Sennheiser AVX Wireless Handheld Mics. I bought them for a project, but ended up using wired mics and never used these mics. They've been sitting unused for a long time. This audio system has excellent range and sound quality. I bought this Sennheiser AVX Wireless Handheld Mic set for a project, but I ended up using wired mics and never used these microphones. They've been sitting unused for quite some time. This audio system has excellent range and sound quality.