Features: Integrated design, small and portable;  Wide compatibility, plug and play. USB receiver is compatible with USB1.1 / 2.0 / 3.0, plug and play, driver free, convenient to use The USB receiver is magnetically absorbed at the bottom and is not easy to be lost;  Specifications: Product Name: Wireless Flip Pen;  Product model: GFPWOBLK;  Product Color: Silver Grey;  Product size: 135 × 28 × 15mm;  Net weight: about 30g (including USB receiver, without battery);  Operating system: Win2000 / WinXP / Win7 / Win10 / MacOS10.13.6 and below version/ Android;  Packager includes: 1 * wireless flip pen 1 * USB receiver Features: Integrated design, small and portable;  Wide compatibility, plug and play. USB receiver is compatible with USB1.1 / 2.0 / 3.0, plug and play, driver free, convenient to use The USB receiver is magnetically absorbed at the bottom and is not easy to be lost;  Specifications: Product Name: Wireless Flip Pen;  Product model: GFPWOBLK;  Product Color: Silver Grey;  Product size: 135 × 28 × 15mm;  Net weight: about 30g (including USB receiver, without battery);  Operating system: Win2000 / WinXP / Win7 / Win10 / MacOS10.13.6 and below version/ Android;  Packager includes: 1 * wireless flip pen 1 * USB receiver Features: Integrated design, small and portable;  Wide compatibility, plug and play. USB receiver is compatible with USB1.1 / 2.0 / 3.0, plug and play, driver free, convenient to use The USB receiver is magnetically absorbed at the bottom and is not easy to be lost;  Specifications: Product Name: Wireless Flip Pen;  Product model: GFPWOBLK;  Product Color: Silver Grey;  Product size: 135 × 28 × 15mm;  Net weight: about 30g (including USB receiver, without battery);  Operating system: Win2000 / WinXP / Win7 / Win10 / MacOS10.13.6 and below version/ Android;  Packager includes: 1 * wireless flip pen 1 * USB receiver Features: Integrated design, small and portable;  Wide compatibility, plug and play. USB receiver is compatible with USB1.1 / 2.0 / 3.0, plug and play, driver free, convenient to use The USB receiver is magnetically absorbed at the bottom and is not easy to be lost;  Specifications: Product Name: Wireless Flip Pen;  Product model: GFPWOBLK;  Product Color: Silver Grey;  Product size: 135 × 28 × 15mm;  Net weight: about 30g (including USB receiver, without battery);  Operating system: Win2000 / WinXP / Win7 / Win10 / MacOS10.13.6 and below version/ Android;  Packager includes: 1 * wireless flip pen 1 * USB receiver Features: Integrated design, small and portable;  Wide compatibility, plug and play. USB receiver is compatible with USB1.1 / 2.0 / 3.