GB-1 Gain Balancer with gain control function. - Model: GB-1 - Function: Gain Balancer - Designer: ALBIT - Input/Output Terminals: 1/4 inch jack - Controls: Gain control It also supports 9V batteries. The rubber feet on the back have been removed, and Velcro is attached. There is no scratchiness and it functions normally, so you can use it with confidence. #albit #Cranetortoise