I would choose the DJI Mic 2. This is one of the best wireless mics currently.

Another mic to consider is the Sennheiser MKE 400. I've used it on my a7CII and have been impressed:

• Shotgun mic design is great for isolating audio from your subject
• Integrated shock-mount and furry windshield
• Three-level sensitivity switch is handy for different situations
• Headphone jack for real-time audio monitoring
• Lightweight and all-metal construction feels durable

The Sony a7CII has a 3.5mm microphone input, so most standard microphones will work. Here are a few good options to consider:

1. Rode VideoMic Pro+: This is a high-quality on-camera shotgun mic that provides excellent audio in a compact form factor. It has a Rycote Lyre shock mount for minimizing handling noise. Runs on AA batteries.

2. Sennheiser MKE 400: Another great on-camera shotgun mic option. It has a super-cardioid pickup pattern to focus audio capture in front of the camera. Powered by AAA battery. Includes windscreen.

3. Zoom H1n Handy Recorder: While not a mic itself, this allows you to record high-quality audio separately and sync in post. It has built-in stereo mics that capture great sound. Provides more flexibility than an on-camera mic.

Consider your budget and recording needs, but any of these will allow you to capture far better audio than the a7CII's built-in microphones. Let me know if you have any other questions!

Sennheiser MKE 600 Shotgun Microphone, best choice for that price.

I use the RODE VideoMic GO II Ultracompact mic, light and compact.

If you think DJI MIC 2 is expensive, get the Rode Wireless Go II: https://www.amazon.com/Rode-Microphones-Wireless-Channel-Microphone/dp/B08XFQ6KP9