JBL Tune 205bt

Bluetooth version 4.1. headphone cable length (cm) 78.0. ... driver sensitivity at 1khz/1mw (db) 100db spl/1mw. dynamic frequency response range (hz) 20 hz - 20 khz. ... weight (g) 16.5. weight (oz) 0.58. bluetooth frequency 2.402ghz-2.48ghz. ... battery type polymer li-ion battery (3.7v, 120mah) ... aluminum finishes yes.