Nikon MQA25020 U3 DS-U3 PC control-based Camera Control Unit via IEEE1394B | eBay
Easy to use, free solution for complex camera control | digiCamControl
Amazon.com: PHOLSY ML-L7 Bluetooth Camera Remote Wireless Shutter Release Control Compatible with Nikon Z30, Z6 II, Z7 II, Z fc, Z50, COOLPIX B600, A1000, P1000, P950 : Electronics