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ClearSounds Quattro 4.0 Lite Bluetooth Listening System Comfortably listen to phone calls or TV sounds with the ClearSounds Quattro 4.0 Lite. The assistive listening device amplifies sounds from a computer or mobile phone up to 30dB. You can discreetly hear the amplified sound by connecting your headsets to the 3.5mm audio jack at the side of Quattro 4.0 Lite. If you're hard at hearing, you can connect your hearing aid with t-coil to the adjustable 8-wire neckloop (included in the package). The Quattro 4.0 Lite uses Bluetooth 4.0 technology and supports HFP, HSP, A2DP, and AVRCP. Conveniently answer calls by pressing the Multi-Function Key (MFK) once. If you tap the MFK twice, the unit will activate the voice control for the paired second device. This means you can use Siri or S voice (Galaxy S3, Note II) through Quattro 4.0 Lite. You can also use the Quattro 4.0 Lite with other ClearSounds products like QT4 Remote Mic Kit (for office meetings), SmartSound Earbuds, QLinkTV Stereo Transmitter, and QH2 Bluetooth Hub/Phone Amplifier.TECHNICAL SPECS: Bluetooth Core: Bluetooth 4.0 Supported Profiles: A2DP, AVRCP, HFP, HSP Amplification: 30dB Frequency Band: 2.4G ISM, Channel 79 Modulation System: GFSK RF Power: Class 2, -6 to 4DBM Wireless Range: Up to 33 feet indoors Number of Paired Devices: Up to 2 Bluetooth-enabled devices simultaneously| Remembers up to 8 paired devices Compatibility: Devices that has Bluetooth 2.1 + EDR Version Connector: 3.5mm headset jack