In addition to the battery already in the unit, I will send you a new battery, so I recommend replacing it with the new one on important days like live performances. (Those who have a power supply do not need a battery.) *The battery expiration date is 6 months. Operation confirmed. In good condition. I will ship it in a box. The BOSS Blues Driver BD-2 is an effector for reproducing blues tones. - Model Name: Blues Driver BD-2 - Color: Blue - Control Knobs: LEVEL, TONE, GAIN - Input/Output Terminals: INPUT, OUTPUT - Brand: BOSS