Stumbled onto this deal while looking for a telescopic controller for my phone.
Although more expensive than competing products, user reviews indicate the GLAP is of higher build quality and doesn't suffer from latency or deadzones issues that you typically see on cheaper products (ipega 9083 etc).
At that price, another alternative would be the Razer Kishi which is usb-C connection rather than Bluetooth as well.
https://www.amazon.com.au/Razer-Kishi-Controller-Android-Pas…