Sometimes it's best to keep it simple. Which is why, in a world of dizzying often over-complex technology, the durable, dependable, and simple stomp box continues to be the most widely used and effective means to expand, color, distort, mutate, sustain, and twist tone. The TS9B is equipped with controls to allow bassists to produce the sound they want while still maintaining the feel of the Tube screamer. Experimenting with the mix and tone controls allows for creation of a limitless number of sounds. Players can get a tight, fuzzy sound with mix control or a mid-scooped, funky sound with 2-band control. Features: Level, Gain, Treble, Bass, Mix Controls Input impedance 500K ohms Output impedance 10K ohms Maximum Output Level 0 dBm Maximum Gain + 30 dB Equivalent Input Noise ?100 dBm (IHF-A) Power Supply One 9 Volt Battery or external AC adaptor (9V) Size 4.9(D) × 3(W) × 2(H)inch Weight 1.3 lbs.