

Any USB audio decoding device lacking its own battery needs to draw power
from your iPhone to function. However, the output current of the iOS device has restrictions, so the chip can’t function optimally in most cases. However, if you can connect the external power supply concurrently, circuit power is improved along with sound quality.
An OTG adapter is required when connecting your iPhone to a USB-C audio decoding device. Thanks to TC28i Pro's efficient side port design, the adapter won’t be excessively long or easily broken while connected, especially when using the device with live broadcasts or video recording when connected to a recording platform and/or power.

*Note
The ddHiFi TC28i is a solid USB-C to Lightning audio cable that delivers clean, reliable digital audio with minimal noise. The build feels premium and durable, and the connection stays snug without popping out. Great choice if you want dependable mobile audio performance without any fuss — simple, well-made, and sounds great for streaming or lossless playback.
Did not work with BTD 700 Bluetooth
These are good quality adapters that will upgrade your experience getting good sound from Apple products into external devices. Good value!