Yes, you can connect multiple devices at once with Sony SBH24.
Yes, Sony SBH24 does have the mic.
No. Sony SBH24 does not have vibration alert.
No. Sony SBH24 does not have the MicroSD card slot. You cannot use the memory card inside.
No. Sony SBH24 is neither waterproof nor water resistant.
No. Sony SBH24 does not have the in-built FM radio.
It takes about 60 minutes to fully charge the Sony SBH24.