【Patented switch between in-ear and half-in-ear anc earbuds】： FIIL Key Pro wireless anc earbuds offers free adaptation between two wearing modes through the innovation of eartips and specialized tuningIn-ear mode for immersion and active noise cancellation, half-in-ear for more comfort and clarity.

【40dB ANC with MAF Noise Tuning】： FIlL Key Pro active noise cancelling earbuds offers a 40dB dual-feed hybrid ANC combined with our patented MAF intelligent noise adjustment system. You will be able to enjoy a precise noise cancellation in different scenarios.

【Dual-mic A.l. plus physical wind noise reduction earbuds】： While adopting FIlL's own tuning A.l. algorithm, which effectively reduces more than 95% of the environmental noise.FIlL Key Pro Earphone also utilizes the "Coanda Effect" through physical wind convection conduit design to cut down an extra maximum of 7.5dB wind noise and transmit your voice clearly during calls.

【Bluetooth 5.4 Dual Device Connectivity】: FIlL Key Pro wireless earbuds noise cancelling earphone equipped with Bluetooth 5.4 chip guarantees a stable output and almost no sense of delay; it supports simultaneous connection of two devices, easily connecting or disconnecting the second device through one click.

【30 hours total battery life】： FIlL Key Pro Wireless Earbuds offer about 6.5 hours of listening time on a single charge (without ANC, 4.5 hours with ANC). The charging case provides 4 more chargings and the case itself can be fully charged in 1.5 hours.With a total battery life of over 30 hours, you’llbe able to immerse yourself in the world of music.

【30 hours total battery life】： FIlL Key Pro Wireless Earbuds offer about 6.5 hours of listening time on a single charge (without ANC, 4.5 hours with ANC). The charging case provides 4 more chargings and the case itself can be fully charged in 1.5 hours.With a total battery life of over 30 hours, you’llbe able to immerse yourself in the world of music.