It seems, from the photo, to be a .22 Long Rifle cartridge typical for a 'zip' gun and not a .38 cartridge. Perhaps the image is not the actual weapon but is 'representative'?
My wife is hard of hearing and routinely misses calls. I determined from Internet search that the old model Samsung S10 phone has the loudest ringer measured in decibels so I bought her a fully refurbished phone and set it up.
I went through scores of 'ringtones' with her listening for what she heard as 'loudest' unsuprisingly this was one with high frequency trilling.
Suggest you search for an Internet site showing Android phone volume comparison. Seems to me, the newer models have diminished volume due to case size and electronics limitations.
Singapore has had facial recognition for some time? But...but...the OP states the initiative promises to set a new standard in airport technology, potentially serving as a model for other airports globally, reported Bangkok Post.