Very easy to set your lock combination. THE CONCEPT IS GREAT BUT UNFORTUNATELY THE PRODUCT FAILED WITHT HE FIRST USE. Make sure you test all three. I will absolutely buy again, just in a smaller size now :-) DO NOT BUY FREEWATERS! I contacted the company and they sent a response to watch the video on their site. This also comes with a nice carrying case so you can store the headset nice and neat. I am 57 for length reference. Poor quality,not to mention a dangerous. Also the free refils were a nice touch although it would have been sweeter if shipping was included but i dont know I have to gage if thats more cost effective than getting bigger refils at my local store.