**Specifications:**
Brand: FIIL
Model: KeyMax
Features: Hi-Fi deep noise cancellation wireless Bluetooth headphones
Compatibility: Requires playback device supporting LDAC decoding
App Support: FIIL+ app for activating functions (paid subscription required)
Noise Cancellation: Up to 48dB deep noise cancellation
Certification: Dual gold standard audio quality certification
Technology: Patented TDDC system for noise isolation
Audio Quality: Hi-Res audio with 40mm Hi-Fi drivers
Battery Life: Over 80 hours of playback time
Modes: Cinema mode for immersive experience
Connectivity: Bluetooth 5.4 and Type-C dual device connection
Call Quality: Dual microphone A.I. for intelligent noise reduction during calls
Design: Stylish and comfortable for extended wear
Additional Features: MAFTM noise cancellation system, voice-preserving ambient mode
Environmental Noise Reduction: Up to 48dB in noisy environments
LDAC Transmission: High-resolution audio transmission for crystal-clear sound
Certification: Hi-Res Audio and Hi-Res Audio Wireless dual gold standard certification
Frequency Response: Up to 40kHz for high-fidelity sound reproduction
Compatibility Note: LDAC playback device required for optimal performance
Battery Charging: Quick charge feature for 5 hours of playback in 5 minutes
Dual Connection: Simultaneous Bluetooth and Type-C wired connection options
Call Enhancement: ENC dual microphone A.I. for clear voice calls
Connection Flexibility: Seamless switch between wireless and wired modes
*Patent Number: CN204948303U*
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