iVoice GX-1 Noise Cancelling Bluetooth Headset (Black) Voice Guided Pairing assitance by announcing the Pairing Code "0000" so Users do not need to refer to User Manual. GX-1 Dual Mic Bluetooth Headset announces "Pairing Succesful" when Bluetooth Connection is Established with your Mobile Phone. INTELLIGENT NOISE SENSOR - GX-1 Dual Mic Bluetooth Headset automatically increases the Volume in your Ears during Conversation when Noise Level in Environment increases, helping you hear Incoming Callers even in a Noisy Environment I CAN TALK (TM) Technology - GX-1 Dual Mic Bluetooth Headset announces the ID of the Caller when the Phone Rings. Multi-Point Technology for Simultaneous Connection to Two Mobile Devices. Comfortable, Self-Stabilizing Silicon Ear Gel and Soft Ear Form Included Rapid Charging with USB Gooseneck and Conventional Wall Charger. Talk Time 6 Hours / Standby Time 200 Hours / Bluetooth V2.1 plus EDR