By using Bluetooth-compatible 5.1 technology and built-in wireless signal, the adapter features stronger signal than traditional 5.0 and more stable transportation over long distances. It is an adapter that allows for quick device search, fast connection and transfer, and is compact and portable. Made of ABS material, the product is lightweight and durable. The length of this product is 2.8 cm, the width is 1.5 cm, and the height is 0.8 cm. It is suitable for Windows 7/8/8.1/10, and is widely used in mobile phones, Bluetooth-compatible keyboards, headphones, printers, gamepads, etc. Item Name: Bluetooth-compatible Adapter Material: ABS Product model: RTL5.1 Chip model: Realtek 8761B Bluetooth-compatible Version: V5.0 Frequency Range: 2.4GHz Transmission Distance: 10-20 Meters Voltage: 5V Interface: USB2.0 Support System: for Windows 7/8/8.1/10 Features: Data Transfer, Quick Connect, Compact Size Details: 2.8cm x 1.5cm x 0.8cm/1.1" x 0.59" x 0.31" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bluetooth-compatible Adapter