The RC-3F is a 3-way footswitch for the GB-10, LR-10, DP-03 and other TASCAM recorders and players. The 2.5mm mini jack plugs into the "remote" jack of these TASCAM products to add features like play/pause, looping or punch in. See the product's user manual for details.
Batteries: 2 AA
Power consumption: 3 mW
External dimensions: 190 x 32 x 122 mm / 7.48 x 1.26 x 4.803 in. (width x height x depth, excluding protrusions)
Cable length: 3.9 m/12.8 ft
Weight: 550 g/19.4 oz. (excluding batteries)
Connector: 2.5mm (approx 3/32") TRS