The APC Smart Signalling Serial Cable is a 4.5-meter black cable with a DB-9 Male connector on one end and a DB-9 Female connector on the other. Designed for use with APC UPS consoles, this 1:1 connection split/duplication cable is compact with a round design and measures 1.5cm in height and 3.5cm in width. This unit is a reliable choice for serial connectivity in computer systems.