The Bluetooth feature built into most A/V receivers (or Bluetooth adapters) is to allow a portable device such as a phone or tablet to stream music to that receiver. This way you can listen to your digital music or streaming apps like Pandora or Spotify from your phone through your main speaker system.
An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints.[1][2] It is embedded as part of a complete device often including hardware and mechanical parts.
Definition of tread. 1  1a (1) : the part of a wheel or tire that makes contact with a road or rail (2) : the pattern of ridges or grooves made or cut in the face of a tireb : the part of a shoe or boot sole that touches the ground; also : the pattern on the bottom of a sole. 2  2a : the upper horizontal part of a stepb : the width of such a tread.