Lenovo USB-C to HDMI Adapter external video adapter - - Walmart.com
Refurbished: Lenovo GX90M61235 USB-C 4 in 1 Travel Docking Station with HDMI VGA, USB 3.0 for Lenovo Yoga 920, 730 and 720 Laptops Docking Stations - Newegg.com
Lenovo Yoga 720 USB C Hub 3.0 Ports 4K HDMI VGA PD Charging Adapter
Product Overview - Yoga 720-13IKB, Yoga720-15IKB - Lenovo Support US