I think of making a robot whic

I think of making a robot which is capable of guarding houses. It should fitted with all sensor and the camera quality which is fitted should be better for example if the owner us not in house the robot will take the charge and guard the house. It should give a buzzer if something strange happened. It should be small in size and smartphone controlled and capable of attack in one go to protect the house. Voice command and auto mode should be there. Battery should lasts longer. Fast charge options.

If you have any further ideas tell me.