Wireless Stereo Lavalier Mini Lapel Smart Phone Microphone For Video Audio

1. **Wireless Connectivity**: Look for Bluetooth or a dedicated wireless transmission system for flexibility and mobility.

2. **Sound Quality**: Ensure it has good audio fidelity, preferably with noise cancellation features to minimize background noise.

3. **Battery Life**: Consider how long the microphone can operate on a single charge, especially if you're planning to record for extended periods.

4. **Compatibility**: Check if it's compatible with your smartphone model (iOS or Android) and any video/audio recording apps you plan to use.

5. **Range**: A longer transmission range is beneficial, especially for larger shooting areas.

6. **Ease of Use**: Look for a plug-and-play design, so you can easily connect it to your device without complicated setups.

7. **Portability**: A compact design makes it easier to carry around, especially if you’re traveling or shooting on location.

8. **Accessories**: Some models come with windshields, clips, and carrying cases, which can enhance usability.