Reverse beeps from an ambulance,engine idle, features radio chatter
Single quick and extremely high pith beep
Several frequencies modulating up and down and in and out
Several high pitch tones chiming out over top of each other,modulating in pitch
Ambulance driving away with rattling from back of vehicle and radio chatter, features reverse beeps ...
Bus starting up, with low air pressure warning beeps
Very high pitched sharp electronic beeps like alien conversation
Exterior of construction site with drilling rig - Rotary Bauer BG 28-H, some background noise and beeps
C4 Explosive Arming Tone - single beep.