Replacement WirelessFinest brand stylus touch screen writing drawing pen, no bluetooth function need, simply press the power button, led light will turn blue and it is ready to be used. Charging usb cable included to charge the pen when need, only need to charge an hour for all day use. Automatic sense active devices and automatic connect to be used for drawing, writing ,etc. Compatible for Lenovo Yoga 900 730 720 Mix Miix 720 510 Flex 6 5 2 in 1