BLUETOOTH CONNECTION-Our eye massager has a built-in speaker that allows you to connect via Bluetooth to play song lists and other audio. Please connect it within 3 minutes after turning on. HEAT FUNCTION-With 100.4¡ãF-104¡ãF heat massage can stimulate massage points more deeply and promote blood circulation to relieve eye muscle stiffness, Relieve eye fatigue, improve eye bags and dark circles, you can switch the comfort temperature according to your needs.