The OP-550S uses silent-click buttons, helping reduce clicking noise during regular computer operation. It has 3 buttons and a button lifecycle of up to 5 million clicks.

Its symmetric design supports comfortable use with either hand, while the 4-way wheel supports horizontal and vertical scrolling. The mouse also features a dust-resistant wheel and supports A4Tech's 8-in-One software.

With a compact 116 × 62 × 38 mm body and black finish, the A4Tech OP-550S is suitable for everyday office, home and study environments. The official A4Tech specification lists Windows 10/11 system support.