The Logitech H540 USB Headset (Logitech part 981-000480) is a wired, on-ear stereo headset for office calls, online meetings, softphone and call-centre use, e-learning and everyday media on a Windows or Mac computer. It plugs straight into a USB-A port and needs no separate sound card or drivers, delivering digital stereo audio through laser-tuned speakers with a 20 Hz to 20 kHz frequency response. The noise-cancelling boom microphone (100 Hz to 16 kHz, bi-directional) reduces background noise so the caller hears the voice rather than the room, and controls on the earcup adjust volume and mute the microphone without reaching for the computer. Leatherette ear cushions and an adjustable padded headband make it comfortable for long days, and the headset weighs only about 120 g. The 1.8 m cable gives enough reach for a desktop tower under the desk. Logitech lists headphone sensitivity of 115 dB +/-3 dB and input impedance of 20 ohms; the headset measures about 180 x 245 x 78 mm. It is a dependable standard-issue headset for businesses and schools.