One of the classic guitar pedals, in it's modern format - the Ibanez Tube Screamer mini.
With a footprint of 95 x 50 mm (excluding jacks) it's small enough to squeeze into even the smallest pedal board and still gives that classic punchy American mid-boosted overdrive tone which works especially well on single coils.
Although it's small its still very solidly built.

3 knobs: Drive (overdrive amount), Tone (hi-cut through mid-lift), and Level (output level). Switch is true bypass. Red LED to show effect is engaged.
Note: This pedal has no battery compartment and requires an external 9V DC power supply (not included).

This Tube Screamer Mini is used but in very good condition apart from a couple of tiny paint chips, one on the right hand side, and one on the base next to the foot (see photos).

Sale includes the pedal, original Ibanez box, and original Instruction leaflet.  No cables are included.
I've tested it with a Fender Strat and amp, across the range of control settings, and it's all working perfectly as expected.