Plantronics - CS540 DECT headset - single-ear wireless headset (mono), 3 different wearing styles - connection to a desk phone - microphone with noise cancelling & range of up to 120 m

Ideal for office workers and employees with landline phones who need a solution to issues from remote workplaces. Audio performance Noise-canceling microphone keeps background noise out of your conversation Talk time and roaming range Better, hands-free work with a roaming range of up to 120 m/400 ft. Talk all day with up to 7 hours of talk time per charge Worldwide warranty & wear 2 years; monoaural, lightweight convertible headset (can be worn either over the ear, over the head or behind the head) When you turn the ear hook down, you will notice resistance, which is normal Remove the earbud and earhook from the headset before installing the headband. 1 Align the headband so that the headset can be fitted as shown and attach the headband to the headset. Turn the headset up.To position the headset optimally, push it inward so that the microphone is located near the corner of the mouth