Ok thanks.
I'm thinking of getting it from here: Original SJ4000 SJCAM brand Action Camera Waterproof Camera 1080P Full HD Helmet Camera Underwater Sport Cameras Sport DV Gopro on Aliexpress.com
primarily because I noticed you said that there are fakes, and this seller makes specific mention. You think that this is a safe choice?
If I wanted to get something like a chest strap and adaptor, where would I go? Are there shops in SSP selling accessories?