The In-Ear Stick from Fischer Amps is a portable front-end headphone amplifier designed to be used on stage with either a balanced mono or an unbalanced stereo signal. It receives signal via its Neutrik combination XLR / 1/4" terminal, boasts an aluminum housing, and is comparatively lightweight at 4.2 oz. It features Burr Brown op-amps to ensure a dependable performance with minimal distortion and a flat frequency response, as well as a built-in electronic limiter in the input section to preserve your hearing. This unit is powered by two AAA batteries, lasting on average longer than 10 hours per set of batteries.