A true bypass looper with two channels in one small box (4.75" x 2.6"). Use it to preserve the tone you've worked so hard by to achieve by adding true mechanical bypass to your non-true bypass effects. Use it as an A/B box. Use it to switch between two entirely different FX loops. Use one channel as a true bypass looper, use the other as a tuner mute. The footswitch on the right is the bypass footswitch. When one of the send/return channels are engaged, a blue LED comes on. The footswitch on the left is the Channel select switch. When send/return channel A is engaged, a yellow LED comes on. When send/return channel B is engaged, a red LED comes on. Takes a 9V battery or standard 2.1mm negative tip adapter.