punQtum Q920, Two-Ear Intercom Headphones, Optimised for punQtum Q110 beltpack and speech intelligibility, 40 mm Ferrite-driver, Frequency range (headphones): 20 - 10000 Hz, Max. SPL: 92 ± 4 dB, Impedance: 200 Ohm, Dynamic microphone, Connection: 4-pin XLR female, Cable length: 1.5 m, Weight: 172 g, PunQtum is a brand of Riedel