Sony DRBT100CX Bluetooth Stereo Earset Technical Information--Connectivity Technology--Wireless::Technical Information--Wireless Technology--Bluetooth::Technical Information--Sound Mode--Stereo::Technical Information--Minimum Frequency Response--100 Hz:: Technical Information--Maximum Frequency Response--4 kHz::Technical Information--Plating--Not Applicable::Earpiece--Earpiece Design--Earbud::Earpiece--Earpiece Type--Binaural::Earpiece--Driver Type--Neodymium::Earpiece--Driver Size--0.35 Interfaces/Ports--Host Interface--Not Applicable::Controls/Indicators--Earpiece Controls--Power, Play/Pause, Stop, Track::Physical Characteristics--Color--Silver::Physical Characteristics--Form Factor--Open Convenient standard USB charging (cable included) Receiver with built-in microphone for use with phone (Hands-Free) function Profiles: A2DP, AVRCP, HFP (1.0), HSP (Ver. 1.1) Volume adjustment Bluetooth Version 2.1