Moondrop KATO and FiiO BTR7

Its really is hard to say a bad word about this combo. You get so much bang for your buck in an amazingly portable package. For your "walking the dog, riding the train, at the office" perfect setup look no further. This even carries weight for those looking for a standalone setup that just so happens to be portable.

KATO Specifications

Driver - 10mm-ULT dynamic driver
Diaphragm - the 3rd generation DLC composite diaphragm
Socket - 0.78-2Pin sunken design
Housing - MIM stainless steel
Nozzle - stainless steel *2, brass *2
Cable plug - 3.5mm stereo single-ended plug
Frequency response range - 10Hz-45kHz (IEC61094, Free Field)
Effective frequency response range - 20Hz-20kHz (IEC60318-4, -3dB)
Impedance - 32Ω±15% (@1KHz)
Sensitivity - 123dB/Nrms (@1KHz)
Distortion - < 0.15% (@1khz, AES17 20khz, A-weight)

FiiO BTR7 Specifications

Ultracompact, Lightweight, and Portable
3-Level Hi-Fi Audio Architecture
PCM Up to 32-Bit / 384 kHz, DSD256 & MQA
3.5 & 4.4mm Headphone Outputs
2 x ES9219C DAC Chips
Two THX AAA-28 Amplifiers
1.3" IPS Color Display
Bluetooth 5.1 with LDAC, aptX HD & More
Wired and Wireless Charging Support
Includes Leatherette Case + Cables