Setup of this calculator was easy, and similar to the larger Retro Classic Keyboards Azio has offered. This calculator connects to more than one Bluetooth enabled device and that connection through Bluetooth can be switched easily. I was most surprised by how heavy this thing is. While it is mostly plastic, it’s chunky, smooth and has a comfortable weight to it with rubber grippies on the bottom 4 corners. It won’t move much if you bump it. In addition to Bluetooth, it can connect through a blue matching in color supplied USB-C cable. There’s a gold toggle on the top side of the calculator that can be switched to Calculator mode where that screen at the top front lights up in white with numbers entered. Note: Each RCBT's top surface genuine leather or wood veneer will have a difference in pattern and shade due to the natural character of the material. Please understand the unit you are purchasing will be similar to the picture shown in the product gallery but will have slight variations. The calculator is rechargeable. I’ve been using it for like 2 months now and it hasn’t needed to be charged yet. Just move the gold toggle to USB mode and it acts like an off switch to save battery if left idle.