The HDMI can support audio output for iMac - (3-in-1 Mini DisplayPort, HDMI, DVI Adapter).
eBay
Mini Thunderbolt to VGA Converter 1080p Mini DisplayPort Display Port Mini DP to VGA Cable Adapter For HDTV For MacBook Air Pro
Aliexpress UK
The product seamlessly connects Mac Book, Mac Book Pro, or Mac Book Air with a Mini DisplayPort to high definition displays with HDMI, DVI or VGA. It is easy and convenient to use, with three output ports: DVI VGA HDMI.
eBay
CABLETIME Mini Displayport to HDMI Cable 4K/HD Thunderbolt 2 Mini Display Port Adapter Cord For MacBook Air Mini DP to HDMI C054
Aliexpress UK
The Mini DisplayPort to HDMI Adapter lets you connect a high definition monitor, projector, or LCD that uses a HDMI connector or cable to a MacBook, MacBook Pro,or MacBook Air with a Mini DisplayPort.
eBay
Mini DP to HDMI 4K cable 3M 10FT Ulrta long Thunderbolt Mini DisplayPort to HDMI cable 4K for Apple Macbook Pro air mini Dell
Aliexpress UK
eBay
CABLETIME Mini Displayport to Mini DP Cable Mini Display port Adaptor White for Macbook/Mac Lenovo Dell 4K display C051
Aliexpress UK
The Mini DisplayPort to HDMI Adapter lets you connect a high definition monitor, projector, or LCD that uses a HDMI connector or cable to a MacBook, MacBook Pro,or MacBook Air with a Mini DisplayPort.
eBay
Mini DP to VGA Cable Adapter Mini Thunderbolt to VGA Converter 1080p Mini DisplayPort Display Port For HDTV For MacBook Air Pro
Aliexpress UK
Connector AMini DisplayPort Male. Connector BMini DisplayPort Male. Cable typeMini DisplayPort. Displayport technologyDisplayPort 1.4. Coax Cables. Antenna & Ariels. Brilliant strap, great value, great quality s8cvh.
eBay
CABLETIME USB C to Mini Displayport Adapter 4K 60Hz for Laptop Macbook Huawei Mate 40 30 pro Samsung S20 Mini DP Converter C384
Aliexpress UK
.
eBay
USB C Thunderbolt3 to Mini DisplayPort 4K@60Hz Cable Compatible with Type-C Macbook Surface Pro PC to Mini DP Monitor Display
Aliexpress UK
The Mini DisplayPort/Thunderbolt to HDMI Adapter lets you connect a high definition monitor, projector, or LCD that uses a HDMI connector or cable to a MacBook, MacBook Pro,or MacBook Air with a Mini DisplayPort/Thunderbolt.
eBay
Mini DP Male to HDMI-compatible Female Mini Displayport To HDMI-compatible Cable 4K Adapter 1080P For Apple MacBook Air Pro
Aliexpress UK