you can see a video of Daxbot in action here: Daxbot Security Patrol Robots. Here are some pricing options:

• 24 Hour Patrol, Year Round: $9,125/mo or $98,550/annually
• 8 Hour Patrol, Year Round: $3,650/mo or $39,420/annually
• Variable Patrol: $1500 for 100 hours, then $12/hour after that

24 hour security is probably overkill and we only really do that for things like data centers or huge warehouses. If you are having security issues at night, my recommendation would be to do 8 hours of patrol from 10PM to 6AM. A 6 hour shift from 11PM to 5AM might work as well, which would be $27,750/year.