Hello! The shutters are built by me. You get the shutter tester, a 1.2 meter (4 ft) cable and a 12 page PDF English manual. About the shutter tester: - Every shutter tester will be tested before shipping. - No loose wires. Everything is soldered onto a board. - The cable is plug and play to allow you to extend it as much as you want and to prevent accidents in case someone trips over it. - No battery and no maintenance needed! The tester works just like an electret microphone (a microphone that does not need a power supply). I have not heard of any computer sound cards that don't support electret microphones but you should still check if your sound card does. - Works for speeds up to 1/1000th of a second ( you can find screenshots in the manual with all the information you need). - Very small and easy to use. - Needs a computer with a sound card and an audio editor for recording. I recommend Audacity because it's free, portable and easy to use. Also, this is the software used in the manual. PM me for shipping quotes or if you have any questions!