FiiO BTR7 Portable High-Fidelity Bluetooth Amp/DAC (Open Box) - Discontinued Version:Apple Deluxe Edition Inner diameter (all sizes) =

Inner diameter (all sizes) = 4mm (can fit 5-6mm)

and with a 3

direct signal paths

enclosed the pictures

giving you excellent high-fidelity performance

FiiO BTR7 Portable High-Fidelity Bluetooth Amp/DAC (Open Box) - Discontinued Version:Apple Deluxe Edition Inner diameter (all sizes) =BTR7 Portable Bluetooth Amplifier Color IPS display High performance DAC ES9219C*2 THX AAA 28*2 amps Wired+Wireless charging support 3. 5+4. 4mm outputs One click dongle mode Qualcomm QCC5124 Bluetooth chip XMOS XUF208 Supports app control and OTA upgrade *The BTR7 standard edition includes a Type C to Type c adapter cable. *The BTR7 Apple edition includes two adapter cables, Type C to Type C and Lightning to Type C. Radiantly brilliant Color IPS