This compact aluminum die-cast case (the so-called MXR size) combines an A/B box and a 2-loop selector! Despite its compact size, it can be used in five different ways! You can't go wrong having one! The second and subsequent images introduce how to use it. ① A/B 2 Loop Box (1IN-1OUT) Connect effectors to each loop and switch them ON/OFF. Use it as a 2-loop + A/B box (A: ON/B: OFF, B: ON/A: OFF) ② 1 Loop Mute Box (1IN-1OUT) Leave Loop B unconnected and use it as a mute switch when B is selected. ③ 1 Loop Tuner Out (1IN-2OUT) Connect a tuner to B's Send and use it as a Tuner Out/Mute switch when B is selected. ④ 1IN-2OUT A/B Box Use the Loop Send as an Out to switch output destinations (e.g., two amplifiers). ⑤ 2IN-1OUT A/B Box Connect from the Return of both AB and switch the input of two guitars/basses. It's super compact, so it won't take up much space on your effector board and is easy to lay out! It also serves as a simple 2IN-1IN-1OUT junction box! Introducing a junction box solves these problems: ・Neatens up the input/output of the effector board by consolidating them in one place. ・Makes setup easy and convenient. ・Prevents deterioration of cables and effector jacks. Since there are 4 lines, you can consolidate IN/OUT, SEND, and RETURN in one place. 【Specifications】 ・Color: Unpainted silver ・Input/Output: 1IN/OUT + 2 SEND/RETURN ・Can be used for both electric guitars and basses. ・Power: Not required (9V input allows LED lighting and 2 DC outputs) ・Format: Mono (Please use general musical instrument cables) ・External dimensions: 60 x 112 x 31 (height) mm