Hi Marie,
It sounds like you want to set up a keyfob style access requirement, which is a pretty cool idea. Our built-in parental controls do not support that, but if you may be able to find another router out there to suit your needs. Right now the options built-in to the HT2000W that I could recommend are 1. setting and automatic turn-on and turn-off schedule for the devices, blocking certain websites or ports/protocols per device.
So say if you know that the Nexus 7 owner uses lots of data on Youtube, you can set up a Parental Control to block www.youtube.com for the nexus 7 between 1pm-7am on Fridays, Saturdays and Sundays but only from 7pm-7am on weekdays.
Alternatively, you can just configure your modem to only allow the Nexus online from 5pm-7pm Mon-Thurs and 4pm-9pm on weekends.
If this seems like something that might work for you, I can make some examples here in my HT2000W so you can see it in detail.
Thanks,
Amanda
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