I've been using the Sony ECM-W2BT Wireless Microphone System on my A7IV for over a year now and I'm super happy with it. Honestly, for weddings, that cable-free setup is a lifesaver when you're rushing between the ceremony and reception. I remember this one shoot in a windy park where I just clipped the mic on the groom and didnt have to worry about a single wire snagging. The audio signal stays digital through the shoe so there's basically zero hiss. If you go with the DJI Mic 2 Wireless Microphone System, you'd actually have to buy the separate DJI MI Shoe Camera Adapter which adds bulk. The W2BT is usually around $200 now, well under your $350 limit. Just make sure you flip the switch on the side of the receiver to Digital instead of Analog. Its way more reliable than messing with 3.5mm jacks in a hurry...

If you want to use that digital multi-interface shoe on your A7IV, the Sony ECM-W3 2-Channel Digital Wireless Microphone is the only one that truly delivers that cable-free experience out of the box. The DJI is a beast but it doesnt actually use the shoe for audio transfer without buying extra adapters, so youd still be stuck plugging in that 3.5mm cable which is exactly what you want to avoid. Based on my time shooting events, here is why the native option makes more sense for your wedding gig:

• The Sony ECM-W3 2-Channel Digital Wireless Microphone sends a pure digital signal. This bypasses the cameras preamp and the conversion that happens in a standard cable, which keeps your audio floor much cleaner.
• It fits your $350 budget perfectly. You can usually find it right at $348 if you check the major retailers tonight.
• Integration is seamless. When you slide it onto the A7IV, the camera knows exactly what it is. You dont have to worry about the cable getting yanked out or catching on your gimbal mid-vows.
• While the DJI Mic 2 2-Person Wireless Microphone System with 32-Bit Float offers internal recording, you lose the streamlined shoe workflow unless you spend more money on the proprietary adapter. Tbh, if you are doing weddings, having one less cable to snag on your gear is huge. The Sony system is just more reliable for solo shooters. I would grab the Sony ECM-W3 2-Channel Digital Wireless Microphone for the native integration alone... it makes the whole rig feel much more solid when things get hectic during the reception.

Can confirm this works. Did the same thing on mine and its been solid ever since.

Following

^ This. Also, I kinda disagree with sticking to just those two! I'm a total nerd for technical specs and SNR data, so I love finding gear that beats the big names on price. Honestly tho, just check YouTube... it is way more helpful.

• search "Sony A7IV digital shoe shootout"
• check r/videography for tests I saw an amazing video last week that breaks down the bitrates perfectly. Just Google it!

To add to the point above: you might want to take a close look at the environment you're shooting in first. Are you gonna be near a lot of heavy WiFi traffic or other wireless rigs in downtown Seattle? I am asking because I had a pretty rough experience with my current setup recently. I noticed the digital signal was dropping or getting some weird artifacts, which shouldnt really happen with a pure digital stream. After a lot of digging into the technical specs and doing some testing, I realized the contacts on my camera shoe were just slightly dirty or oxidized. The tolerances on those tiny pins are honestly ridiculous. I had to do a whole DIY cleaning routine with high-purity alcohol and a magnifying glass to get it stable again. It taught me to be super cautious about the cable-free dream. Even though the shoe is great, if one of those pins isnt making perfect contact, you're gonna have a bad time. Make sure you check your pins for any debris or oxidation before the gig because that digital interface is way more sensitive than a standard 3.5mm jack.