The Sennheiser EW-DX SK 3-PIN (S1-10) is a digital UHF bodypack transmitter identical in function to the EW-DX SK but fitted with a 3-pin audio input connector instead of a 3.5 mm jack, which suits microphones and instrument cables terminated for 3-pin bodypack inputs and avoids swapping cables when moving from other 3-pin systems. It is part of Sennheiser's Evolution Wireless Digital EW-DX series, the multi-channel, rack-oriented step up from EW-D, and works with EW-DX EM 2, EM 2 Dante and EM 4 Dante receivers. This S1-10 version covers 606.2 to 693.8 MHz, so check the band is permitted where you operate. Audio bandwidth is 20 Hz to 20 kHz with 134 dB of dynamic range and 1.9 ms latency, and Bluetooth Low Energy is used for app-based setup and sync. It runs on two AA batteries or the BA 70 lithium-ion rechargeable pack, operates from -10 to +55 degrees C, and measures about 63 x 80 x 20 mm without the antenna. RF output is 10 mW ERP. It is sold as the transmitter only; microphones, receivers and rechargeable packs are sold separately.