1. The mouse Bluetooth headset sk18 is made of silicon microphone, while the mouse Bluetooth headset sk19 is made of silicone.

2. Bluetooth headset sk18 for mouse uses Bluetooth 5.2 chip, and the call connection is more stable, the call is clearer, and the sound quality is very good. Bluetooth headset sk19 for mouse uses the original chip, and the sound quality is relatively poor.