Adapter: 1 x 2.5 mm mono plug to 3.5 mm mono socket (PA3) plug adapter

The PA3 adapter adapts a 2.5 mm diameter mono plug to fit a 3.5 mm diameter mono Socket

NB Most Olympus and Philips digital recorders have 3.5 mm sockets; Olympus Pearlcorders and early Philips minicassette recorders have 2.5 mm sockets.