@violet @natecull there should be a picture of a USB stick for scale...the picture is very zoomed in; that circuit board is no more than 10mm wide.
@SexyCyborg did a video on these sort of things you could buy in Shenzhen or on TaoBao or Alibaba. USB cables that intercept data, functional iPhone charger clones with built in cameras and microphones etc...some are cheesy but others are very convincing.
Never accept tech gifts from strangers!