The ACEFAST H9 are comfortable over-ear Bluetooth headphones with active noise cancelling (up to ~30 dB) to reduce everyday distractions on commutes, at the office or in class. Their 40 mm Hi-Fi drivers deliver clear, balanced sound, and Bluetooth 5.4 keeps your connection stable up to 10 meters. A large 500 mAh battery powers up to ~55 hours (or ~45 hours with ANC on) and recharges via USB-C (5V/1A) in about 2.5 hours. The multifunctional knob makes volume, calls and playback intuitive, while the 90° rotating earcups, memory-foam cushions and adjustable headband add all-day comfort—ideal for Android, iPhone and PC users in Bangladesh looking for long battery life with effective noise reduction.