BOSS WL-20 WL-20L Guitar Wireless Dedicated Case *The main unit is for display purposes only; the product is the case.* We've created a case with perfectly sized inner compartments for the receiver and transmitter, allowing for secure storage with minimal movement and in the smallest possible size. External dimensions are width 54mm x depth 45mm x height 93mm. Although we're not certain if it was a perfect fit, we've received feedback that it can also be used for the 20L model. The lid closes with a satisfying click and is unlikely to open on its own, but it opens easily with a press from the side. There's no chance of it falling open even when turned upside down. Because of this, you can attach double-sided tape to the back of the lid and stick it directly to an effects pedal case (^^). There's no corner interference during opening and closing, which is common with this type of product, allowing for very smooth operation. We had some concerns about leaving it directly on a surface during charging, so we've designed it so that you can plug in the charging cable while the units are stored inside.