Donno if it helps, but it'll use "Dual 2.4G Wireless-technologie".
i'd put money on it not being wi-fi, that just means it's running at 2.4GHz, though that doesn't include the Hz, so it could really be anything
it'll be something similar to the dingoo a330s wireless module, probably something available/very similar to the transmitter and reciever pairs you can buy from component shops
though it's better than nothing, and it would need both the tx and rx in the handheld, so it's theoretically possible to get a set of modules and plug them into a pc (with a little work)