FIIO FT5 90mm Open Planar Magnetic Headphones

Issue with BTR5 connecting to laptop

FiiO CP13 Portable Cassette Tape Player with 3.5mm Earphone Jack, Ultra-Low Wow&Flutter, Powered by Type-C or Lithium Battery (White and Black)

FiiO M6 High Resolution Lossless Music Player

FiiO NEWK3 Amplifier Headphone Amps Portable High Resolution 384kHz/32bit DSD256 USB Type-C Lossless for PC/Laptop/Smartphones/Speaker Home Audio

FiiO JadeAudio KA3 Headphone Amps Tiny Amplifier USB DAC High Resolution Supports 32bit/768kHz and DSD512 Headphone Outputs 3.5mm/4.4mm for Smartphones/Laptop/PC/Players

FiiO K5 Pro Headphone Amps Portable Desktop DAC and Amplifier 768K/32Bit and Native DSD512 for Home/PC 6.35mm Headphone Out/RCA Line-Out/Coaxial/Optical Inputs