i bought one already but the experience is not good at all; c5 B" C9 ]; a
can hardly hear the sound in noisy area such as inside MTR3 q$ ?1 W) w8 K1 a, B- r' h
if turn volume to very loud, you can feel the vibration and not comfortable / X0 V- b( f6 y P$ ~ 7 E) B8 g' h6 H& Q; F# y+ ionly suitable for running , not for everyday use - P8 B% e6 ^: T: i7 g