Set access codes that limit the duration or traffic consumption that your kids can use. Generate a code which let's say allows 12 hours of internet usage within a week. Access codes will expire automatically so they need to ask for an other access code if they want to use more. You can give them 1 hour extra as a treat.
We support many hardware and firmware which you can use to run the client software directly. It will communicate with our web, database and radius servers and handle redirection and authentication.
You can also use your existing hardware and network if you put a hotspot gateway device behind your network. This can also be a supported router or even a PC. In this case you don't need to change your existing configuration to make it compatible with out system, you only need to add one more device.