● The Jabra EVOLVE 20 MS Mono is a headset optimized for single-ear type MS. ● DESIGNED FOR VOICE AND MUSIC: The best combination of microphone and speaker is designed to provide the best experience for both voice communication and listening to music. ●Passive Noise Cancellation: Simply attach the headset to passive noise cancellation with specially designed speaker cushion, protecting the user from high frequency noise such as human voice. ● Easy call management: The headset with inline call controller allows quick access with large buttons and LED indicators to increase users productivity and convenience. Answer/end calls, adjust volume, mute the microphone. Foam ear cushions included.