I am looking for a USB Switch which allows one device like a keyboard to be connected to 2 systems such as a PC and Laptop and with a button or something you can switch between which system the USB is connected to.

I have seen USB Switches where you can connect multiple devices to the one USB port on a system (similar to a USB Hub but only one device is active on the system) but never where the one device can switch between the 2 systems but this could be because it may go by another name or quite possibly does not exists (though i can't understand why, it seems like an elementary peripheral for USB Harddrives/Harddrive Docks)

I am looking for one because at work when my break comes in i may want to switch to doing some work on my laptop and i can save a lot of time by setting it up on my desk like another screen and then just switch the keyboard and mouse over to it and back during my break (incase if during my break something catastrophic happens and i need to do work-work during my break) and turn my chair around than having to pick it up, move the keyboard and mouse away and ensure the power cable is still going behind the desk so no one trips, and then doing that in reverse.

I am looking for a USB Switch which allows one device like a keyboard to be connected to 2 systems such as a PC and Laptop and with a button or something you can switch between which system the USB is connected to.

I am looking for one because at work when my break comes in I may want to switch to doing some work on my laptop and I can save a lot of time by setting it up on my desk like another screen and then just switch the keyboard and mouse over to it and back during my break (in case during my break something catastrophic happens and I need to do work  - work during my break) and turn my chair around than having to pick it up, move the keyboard and mouse away and ensure the power cable is still going behind the desk so no one trips, and then doing that in reverse.