MARVO Wireless Keyboard and Mouse Combo (Battery Not Included); 2.4G Ergonomic Wireless Computer Keyboard with 9.84inch Phone Tablet Holder; Silent Mouse with 6 Button(800/1200/1600 DPI Adjustable); Compatible with Windows XP / Vista / 7 / 8 /10 and MACOS operating systems; MARVO Provide 12-month Worry-free warranty and friendly customer service; When connection, red power light will blink for 5-8 seconds and then turn off, in low battery mode, red power light will blink when you press any key. So it is normal for the red light to blink for 5-8 seconds when you first start using the device.