SBS9845X SG Boarded 727U two days ago and saw a long EDS inside the bus on the ceiling. Looks like the habit bendy kind but its black and more rounded. Wonder what is it for.
^tamago^ SG 821E has a LCD TV with "GDS coming your way...". shld be some trail of some sort of Visual Passenger Information System (VPIS).
SBS3688Y SG I remembered travelling on a bus with ceiling mounted EDS on svc 171 abt three years ago (unsure if its TIB727U). The EDS would flash the bus-stop locations throughout the journey. eg : Sembawang Air Base; Khatib Camp...... I believe the descriptions were manually updated by the driver then.
BluBlur SG 977P or 978L has a speaker mounted below the aircon cage, behind the driver's cabin. Also has a long flexible microphone like thing at the driver's window. 1182J also had a LCD, but was removed for quite some time.