devicetype 7 means Set Top Box

A set top box, typically operator hardware from a cable, satellite, or IPTV provider.

List: Device TypesValue 7

When to send it

Send 7 when the ad will play through a set top box attached to a television, the kind of hardware a cable, satellite, or IPTV operator supplies. It arrived in OpenRTB 2.2. Requests for operator boxes often come from server-side ad insertion systems, so Imp.ssai and the forwarded device IP and user agent matter as much as the device type.

CTV buyers usually treat 7 the same as 3 for targeting. The list does not draw a sharp line between 7 and 6, and retail streaming boxes are reported as either depending on the seller. Whatever the choice, keep it consistent across an app's traffic, because a buyer that sees the same App.bundle arrive as both 3 and 7 cannot tell which to trust.

Example

{
  "device": {
    "devicetype": 7
  }
}

Fields that carry it

Other values in device types

ValueName
1Mobile/Tablet - General
2Personal Computer
3Connected TV
4Phone
5Tablet
6Connected Device
8OOH Device

The device types list page explains the whole list and its common mistakes.