The compatibility of Wifi Display Dongle Transmitter can be ensured through different aspects when connecting to multiple different devices.

1. Support multiple frequency bands and multiple channels: Wifi Display Dongle Transmitter should support multiple frequency bands and multiple channels to adapt to the needs of different devices and environments. This prevents channel conflicts and interference, providing a more stable and reliable wireless connection.

2. Provide compatibility testing and certification: Wifi Display Dongle Transmitter can verify its compatibility through certification and testing by relevant agencies. For example, the Wi-Fi Alliance offers a certification program that ensures a device's compatibility with Wi-Fi standards and verifies its performance when interacting with other Wi-Fi devices.

3. Update firmware and drivers: Manufacturers can promptly release updated firmware and drivers to fix and improve device compatibility issues. Users can regularly check for and install these updates to ensure that their devices remain compatible with newly developed devices and technologies.

4. Provide detailed instructions and support: The manufacturer of Wifi Display Dongle Transmitter should provide clear and detailed instructions and support documentation to help users set up and configure the device correctly and avoid compatibility issues. In addition, manufacturers should also provide timely customer support to resolve compatibility and connectivity issues encountered by users.

To sum up, the compatibility of Wifi Display Dongle Transmitter can be guaranteed by complying with standards and protocols, supporting multi-band and multi-channel, conducting compatibility testing and certification, providing updated firmware and drivers, and providing detailed usage instructions and support. This ensures that the device can connect and communicate effectively with many different devices.