FiiO BTR15 Portable High-Fidelity Bluetooth Amp/DAC Color:Blue The bore (inner diameter of

The bore (inner diameter of the tip) is the same as TWS at 4

Unique notch filter technology

The Pair features auto-pairing

we experimented with placing different materials behind the driver in the earcup – the results showed the headphone responding strongly to any changes

The metal hardware is cast zinc and manganese spring steel

FiiO BTR15 Portable High-Fidelity Bluetooth Amp/DAC Color:Blue The bore (inner diameter ofBTR15 Bluetooth DAC and Headphone Amplifier QCC5125 + XU316 high performance combo Change modes with just one button Global parametric EQ 3. 5mm+4. 4mm dual outputs 0. 96 inch OLED display Dual curved glass Independent power supply for amp Dual DACs for fully balanced Comprehensive battery protection Change modes with just one button Due to the BTR15's ability to work as a Bluetooth receiver and as a USB DAC, we have implemented a PC BT PHONE mode