FIIO M21

Tech Specs:

Size: Approximately 68mmx121mmx17mm
Weight: Approximately 193g
Main controller: Qualcomm Snapdragon 680
System: Android13
DAC chip: CS43198*4
Screen: 4.7-inch (750x1334) fully integrated screen
Battery capacity: 4000mAh
Power supply: Supports PD2.0 and PD3.0 PPS fast charging
Battery life: 15h on single end, 11.5h on balance
Running memory: 4GB
Body memory/available memory: 64GB/approximately 52GB
Memory card expansion: standard TF card slot, supporting 2TB
Earphone output interface: single ended 3.5mm PO/LO/SPDIF+balanced 4.4mm PO/LO
USB interface: Type-C USB 3.0 * 1 (charging/data transfer)+
Type-C POWER IN * 1 (charging/independent power supply interface)
Bluetooth version: five
Bluetooth transmission: AAC/SBC/aptX/aptX HD/LDAC/LHDC
Bluetooth reception: SBC/AAC/LDAC
Output power 1: L+R ≥ 950mW+950mW (320/THD+N<1%/balanced/large ear mode)
Output power 2: L+R ≥ 185mW+185mW (3002/THD+N<1%/balanced/large ear mode)
Output power 3: L+R ≥ 405mW+405mW (320/THD+N<1%/single ended/large ear mode)
Output power 4: L+R ≥ 45mW+45mW (300/THD+N<1%/single ended/large ear mode)
Output power 5: L+R ≥ 750mW+750mW (320/THD+N<1%/balanced/high gain)
Output power 6: L+R ≥ 290mW+390mW (320/THD+N<1%/single ended/high gain)
Signal to noise ratio: ≥ 126dB (A-weighted)
Bottom noise:< 1.6uV (A-weighted)
Output impedance:< ten
THD+N: <0.0003%(1kHz/ -4dB@322 )