There are a complete of five sound concentrations continues as altered if the gadget is switched on and off; To boost sound level: Faucet and hold “Fn” key and faucet ”Correct” arrow crucial; To decrease audio level: Faucet and hold “Fn” critical and tap ”Remaining” arrow critical. The Logitech K780 https://supertop-shop.com/wireless-bluetooth-virtual-keyboard/