The Autonics CT4S-1P4 is a compact 4-digit 7-segment LED display/controller designed for precise counting and timing. It supports counter functions (count up, count down, count up/down) and timer functions (count up, count down), uses a terminal block, and offers a 1-stage preset output with a SPDT relay and an NPN open-collector output. It operates from 100–240 VAC at 50/60 Hz and accepts an external power supply up to 12 VDC. Signal inputs can be voltage input (PNP) or no-voltage input (NPN). The maximum counting speed is configurable up to 10k cps, with a minimum input width selectable as 1 ms or 20 ms. Memory protection is about 10 years. Setting ranges cover 0.001 s to 9,999 s and extend to several longer scales, while the device provides outputs for SIGNAL ON DELAY, POWER ON DELAY, FLICKER, INTERVAL, SIGNAL OFF DELAY, ON-OFF DELAY, and INTEGRATION TIME. The front panel is IP65 protected, the counting range is -999 to 9,999 with a decimal point up to the third digit, and the minimum widths for RESET and INA/INH/RESET inputs are 1 ms or 20 ms. Operating temperature ranges from -10 to 55°C (storage -25 to 65°C) and humidity from 35 to 85% RH (storage the same). This makes the CT4S-1P4 a versatile choice for compact industrial counting, timing, and interval control.