Cobiro uses one shared budget for all your campaigns created by Cobiro. The shared budget is also the daily budget you have set during the setup of your Cobiro account. It is the highest amount that you feel comfortable spending per day on your ads.
Depending on your ad performance and the search traffic, the total daily cost of your campaigns can be up to twice your daily budget. This means your campaign is spending more of your daily budget on days with higher search traffic and less on days with lower traffic. The monthly cost will never be more than your daily budget multiplied by 30.4. You can read more about your budget in Google Ads here.