General Specifications
Name/Model FW3 Hardware solution "DAC: AK4332
Bluetooth: QCC5141"
Color Space gray Configuration 1DD
Bluetooth version Bluetooth 5.2 Max sampling rate 96kHz-24bit
Bluetooth(5.2) codec SBC/AAC/aptX/aptX Adaptive/LHDC Supported protocol A2DP/AVRCP/HFP/HSP
Bluetooth distance ≈10 metres FiiO Control
Weight "≈ 6.2 g × 2 (units)
≈44.8 g (charging box only)
≈57.2 g (in total)"
Dimensions "28.4*22.9*22.6mm (units)
68.4*43.9*32.5 mm (charging box)"
Firmware upgrade Firmware upgrade    
Main buttons Click: Pause/Play/Answer incoming call Secondary button Click: volume-(left unit)/volume+(right unit)/answer call
Double tap: voice assistant Long press for 1s: previous song (left unit)/next song (right unit)/reject call/hang up call
Long press for 1s: reject the call/hang up the call Long press 8s: reset
Press and hold for 2s: power on    
Press and hold for 5s: power off    
Supported Features (Setup via FiiO Control)    
Game mode Bluetooth latency will be lower, power consumption will be increased. Indicator switch Set the earphones indicator on and off
Charging protection Units will stop charging when reach to 85% Power saving shutdown Set the timed shutdown(when music paused)
Bluetooth code selection Select the Bluetooth code that needs to be used, and the unselected code will be prohibited Equalizer Support EQ and PEQ adjustment
Channel balance L12 ~ R12 (0.5 dB per level) Filters A total of 4 kinds of filters are available: steep drop/slow drop/short delay steep drop/short delay slow drop
Power parameters
Charging time Units: ≈1h Battery capacity Units: 65mAh
Charging box: ≈1h 40mins Charging box: 380mAh
Battery life ≈7h (units) + 14h (charging box) Call time ≈ 5h30min
Test conditions: aptX, mobile phone: full volume, units: volume 16 est conditions: aptX, call: volume 24, units: volume 16
Power input 5V 1A and above    
Audio parameters
Impedance 32Ω@1kHz Sensitivity 106dB/mW (@1kHz)
Frequency response 20Hz-20kHz SNR (DAC+AMP) ≥106dB (dbA)
THD+N(DAC+AMP) <0.0016%(1kHz/32Ω)