Toshiba rze-bt110e weighs just 20 gm, flexible in-ear design and soft silicone ear fins give a firm, secure fit to ears and enable comfortable wearing without falling out for extend periods of time, built-in microphone lets switch between stereo music and calls, in-line remote have five buttons to control calls and music (play, pause, change volume, call pick/ reject) bluetooth version 4.2 + edr technology is perfectly compatible with most bluetooth enabled devices and ensures a connection range of up to 10m, toshiba rze-bt110e can also connect to two bluetooth devices at the same time charging via usb port, battery charging time is up to 2 hours and on a single full charge it delivers a battery life of 4 hours for music playback or as talk time