# ImpressionSignal

> [!WARNING]
> Display \& Video 360 API v3 has sunset. Use [v4](https://developers.google.com/display-video/api/reference/rest/v4) instead.

Supported impression signals for Algorithm Rules.

| Enums ||
|---|---|
| `IMPRESSION_SIGNAL_UNSPECIFIED` | Unknown signal. |
| `DAY_AND_TIME` | The day of the week and hour of day the impression was made using browser's local time zone. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.day_and_time_value` field of the comparison value. |
| `DEVICE_TYPE` | Device type. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.device_type_value` field of the comparison value. |
| `AD_POSITION` | Ad position. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.on_screen_position_value` field of the comparison value. |
| `OPERATING_SYSTEM_ID` | The operating system identifier. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.int64_value` field of the comparison value. |
| `MOBILE_MODEL_ID` | The mobile model identifier. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.int64_value` field of the comparison value. |
| `EXCHANGE` | Exchange. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.exchange_value` field of the comparison value. |
| `ENVIRONMENT` | Serving environment. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.environment_value` field of the comparison value. |
| `COUNTRY_ID` | The country or region identifier. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.int64_value` field of the comparison value. |
| `CITY_ID` | The city identifier. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.int64_value` field of the comparison value. |
| `BROWSER_ID` | The browser identifier. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.int64_value` field of the comparison value. |
| `CREATIVE_DIMENSION` | Creative height and width in pixels. Value is stored in the `https://developers.google.com/display-video/api/reference/rest/v3/AlgorithmRules#ComparisonValue.FIELDS.creative_dimension_value` field of the comparison value. |