AGPtEK Hands-Free Call Center Noise Cancelling Corded Binaural Headset Headphone with 4-Pin RJ9 Crystal Head and Mic Mircrophone for Desk Phone - Telephone Counseling Services, Insurance, Hospitals &diams; DESIGN FOR CLEAR CHAT - AGPtEK headset is built-in flexible adjustable microphone which can be twisted discretionarily to pick up your loud & clear voice. Reduces unwanted background noise for clear conversation. &diams; DURABILITY & WEARABILITY - The headset is made of the flexible metal hose with the positioning accuracy. Helical headphone cable which will avoid damaging during the use. &diams; COMFORTABLE TO WEAR - This headset headphone is designed with adjustable headband and fluffy earpads pad with memory foam. Enjoy extended comfort with padded earpad and flexible headband. Also, our hearing protection technology in AGPtEK headset cares of the user's hearing. &diams; EASY TO USE - Direct connect over the head headset, no additional amplifiers or adapters required. &diams; 30 DAYS RETURN -- If you are unsatisfied with the headset telephone, simply return it within 30 days for a full refund. 150ohms speaker, to ensure the perfect voice quality Compatible for the most telephones in call center Application for Phone sales, Telephone Counseling Services, Insurance, Hospitals, Banks, Telecom operators, Enterprises. Microphone type: electret condenser microphone(ECM) Microphone sensitivity: 40db3db Microphone voltage: 2.0v Receiver impedance: 15010 ohm Package Include:1* 4-Pin RJ9 Crystal Binaural Headset