Our metal detector for kids can detect but cannot distinguish metal; because its design and functionality are focused on simplicity and safety for children's use. 

Suitable for most types of helmets on the market, such as faceless helmets, full helmets, pull helmets, 3/4 helmets, vintage helmets, and half helmets. 

Yes...most of these action cameras is the gopro mounts 

Please verify your camera's lens thread size(usually marked somewhere on the lens barrel or printed underneath the lens cap) before ordering.The number is always preceded by a "ø" (diameter) symbol 

I actually have not received this adapter yet. It's shipping from China. Don't think that was disclosed in the ad. However, I do not believe this is for the Pentax Q body rather for digital and film cameras that take the Pentax K mount in its many variations. So I'm expecting to be able to mount my Leica M mount lenses on my digital and film Pentax K mount cameras, no autofocus or relay of exposure information, only to be used with manual focus and exposure.