MCHOSE M7/M7 Pro Wireless Gaming Mouse PAW3395 2.4g Bluetooth 8K Three-mode Ergonomic Design 56g

1.Does it support using a 4K receiver?: The M7 can only operate with its accompanying receiver. If you need to set the 4K report rate, you can adjust it within the driver settings.

2.The purpose of the 8K receiver: It's eight times faster than a wireless mouse with a 1000Hz report rate, allowing for faster response times and lower latency (the 8K receiver needs to be purchased separately and is only compatible with the receiver linked here).