This is a battery box for using CR123A batteries with the Sesame Open Sensor. The version has been updated, and black and white are now available. This product is black. The one I made for myself has been running continuously for over 200 days and is still going strong! The standard battery is a button battery, but because it runs out of power frequently, I created a battery box that can use CR123A batteries, which have about 10 times the capacity. Since it can be used with the batteries of other Sesame parts, it should also make inventory management easier. This is a self-made part using ABS-like resin created with stereolithography. Please understand that this is a personal creation, except in cases where there are issues such as it being unusable. Batteries, the Open Sensor itself, and double-sided tape for adhesion are not included. Please prepare them yourself. ※ Although the battery level of the Open Sensor is now displayed due to Sesame updates, the judgment is for button batteries, so the remaining battery level will not be displayed correctly when using CR123A batteries.