This is a DI box designed especially for guitars, for use with line level preamps, or to be connected between amp and speaker, enabling direct to mixing desk recording without microphones. Its integrated filter circuits simulate the authentic speaker sound. Tone can be varied between ;mellow;, ;normal;, and ;bright;. It has an input of 6.3mm jack with parallel ;Thru; socket, a male XLR transformer balanced output, an attenuator of 0dB for line signals, -15dB for small amps up to 10W, and 30dB for large amps up to 200W. No battery necessary.