Great lock and super easy to install. Would highly recommend.

I am what we now call a hybrid teacher during this pandemic. So I must wear a mask while trying to teach students in class as well as remotely. So I bought the amplifier to make sure the back of the room can hear me through the mask. It works so well that other teachers bought it. I can walk with my headset 48 feet and it still amplify my voice. I can walk around my entire science lab room and every student can hear me. This is the important part of my job. So the voice amplifier is well with the money.

prompt delivery, good quality, feels solid, however yet to test it.

I love these earbuds, had them for almost a year and they are awesome for working out. I have another wireless pair (TOZO) which are great but push out of my ears when working out. So I use these as my default Bluetooth earbuds. Comfortable, good bass and fantastic for the price.