Other upgrades, adapters and converters one might need depending on device and DAC used.
Cable upgrades;
Linsoul Tripowin Zonie 16 Core Silver Plated Cable SPC Earphone Cable
US$ 20-26
Adapters & converters;
[Apple MFi Certified]Apple Lightning to USB Camera Adapter USB 3.0 OTG Cable Adapter Compatible with iPhone/iPad,USB Female Supports Connect Card Reader,U Disk,Keyboard,Mouse,USB Flash Drive-Plug&Play
US$ 10
Apple Lightning to USB Camera Adapter
US$ 29
USB Camera Adapter with Charging Port, Portable USB Female OTG Adapter Compatible with iPhone iPad, iPad to USB Adapter Plug and Play Support Card Reader
US$ 14-19
USB Camera Adapter, USB Female OTG Adapter Compatible with iPhone iPad, Portable USB Adapter for iPhone with Charging Port, No Application, Plug and Play
US$ 16
USB C Female to USB Male Adapter (4-Pack),Type C to USB A Charger Cable Adapter,Compatible with iPhone 11 12 Pro Max,iPad 2020,Samsung Galaxy Note 10 S20 Plus S20+ Ultra,Google Pixel 4 3 2 XL(Red)
US$ 9
USB C DAC OTG Cable 0.5ft/15cm for iPhone/iPad/iPod Oxygen-free Copper Core, iOS15 to Type C Male Adaptor for Amplifier, Fiio BTR 5 Q3S BTR3K, qudelix 5k, xd-05 Plus, HIDIZS S9 PRO, Shanling UA2 13Pro
US$ 17