Which bid adjustments can be made at both the ad group and campaign level?

Device bid adjustments can be set at both the campaign and ad group levels. This allows for granular control, letting you increase or decrease bids based on whether users are searching on mobile, tablet, or desktop. For example, you might bid higher on mobile at the ad group level for a specific product if you know those users convert well on their phones, while maintaining a different device bid strategy at the campaign level for overall performance. Day of week, geography, and hour of day adjustments are typically set at the campaign level only, providing broad targeting control but lacking the ad group-level specificity for these dimensions.