Sennheiser EW-DX SKM-S R1-9 is a digital wireless handheld transmitter with a switch, ready for use with whichever microphone capsule best suits your needs. With a metal housing, the robust handheld transmitter suits perfectly for daily use on stage. Adding to that a persistent E-Ink display and charging contacts for in-device charging it makes this the best in class wireless system we’ve seen No capsule included – so here are a few great choices: For entry-level presentation or stage use, choose MMD835 (cardioid) or MMD845 (supercardioid). Professional entertainers may enjoy the extra clarity with the next step up, MMD935 (cardioid) or MMD945 (supercardioid). If you’re touring, or simply play on a loud stage, have a closer look at the new premium touring capsules, with high-rejection of feedback, and an ultra-clear sound – MM 435 (cardioid) and MM 445 (supercarioid). Frequency Set: R1-9 = 520 – 607.8 MHz Ditch the single use AA batteries: For all EW-DX Series wireless, the smartest choice it to use the BA70 Lithium Ion battery pack. It delivers up to 12 hours of operation (as opposed to up to 8 hours of operation with AA batteries). You can charge a couple of BA70 Li-Ion batteries with the L70 USB charging dock – or grab them together in the EW-D CHARGING SET package.