Sequence of very high-pitched, fast, digital tones, as if data are being processed.
Quick ascending sequence of fast high pitched digital tones
Succession of two fast low pitched beeps
Pressing clicky and plasticky calculator buttons, fast
Fast digital high pitched beeps as data is being processed
Typing quickly on a calculator
Pressing several plastic calculator buttons
Pressing a calculator button
Sequence of fast medium pitched beeps
Digital, high-pitched bleeps.