- 2 x switching (normalling) stereo jack and switching ground contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fav B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, switched, full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj4hhd2 M Series, 6.35mm (1/4in) mono jack, switched, with half threaded nose, https://www.neutrik.com/en/product/nrj6hf Slim Jacks, 6.35mm (1/4in) mono jack, switched, half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj4hf-1 Slim Jacks, 6.35mm (1/4in) mono jack, switched, with a capacitor / resistor pair, see Fireball's hard sync to schematic, laid out PCB with on-board antenna Bluetooth Dual-mode module with.