Description: Multipurpose Audio Transmitter Receiver: USB V5.1 Adapter supports multiple device connections like computers, mobile phones, keyboards, mouse, headphones, printers, gamepads and other devices. Powerful: Adopt 5.1 chip with fast transmission speed, stable connection, wider connecting range up to 20 meters, low latency, support dual modes,support data transmission and audio transmission. Compatibility: Automatically backward compatible with version 5.0 4.0 3.0  2.0 etc. Fully compatible with for win7 8.1 10 11, install the driver, easy to use (Note:  not support for IOS system). Features: Automatic memory reconnection, compact mini size, easy to carry, suitable for home, travel, office use. Easy to Install: Low power consumption, high sound quality, can connect multiple devices (max up to 7 devices )at the same time to meet various needs. Specification: Product model: BT513-5.1 Chip solution: RTL8761 Transmission distance: 20 meters Version: V5.1 Wireless protocol: A2DP , HSP , AVRCP , HID etc. Material: PCB material Size Chart: 1.5cmx1.4cmx0.55cm/0.59inchx0.55inchx0.22inch Package Includes: 1 Piece USB V5.1 Adapter Note: Please allow slightly errors due to manual measurement and different monitors.