COOLBOX AIR40 wireless headphones

Features: - Active Noise Cancellation (ANC): Active Noise Cancellation technology allows you to reduce unwanted background noise as much as possible, so you can focus on the music or content you are playing. - Full autonomy: up to 25 hours with ANC noise cancellation mode activated or up to 40 hours with ANC deactivated. - Bluetooth 5.3 or 3.5mm jack connectivity: this revision of the Bluetooth connection represents an improvement in energy consumption, allowing for longer battery life. In addition, they have a 3.5mm jack wired connector for compatibility with devices that do not have a Bluetooth connection (requires jack cable, not included). - Ergonomic design: very light (175 grams) and comfortable to use. Specifications: - Bluetooth: 5.3. - Range: 10 meters. - Frequency range: 20Hz ~ 20kHz. - Speaker (diameter): 2 x 40mm. - Impedance: 32 Ohm. - Active noise cancellation: 20 dB. - Sensitivity: 110 +/- 3dB. - Battery: Internal, lithium, non-removable, 3.7V, 400mAh. - Charging time: 1.5 hours (approx.). - Controls: Play / Pause / Power / Volume+ (Track forward) / Volume- (Previous track) and ANC selector. - Connections: USB-C (charging) and 3.5mm jack (operation without Bluetooth, cable not included). - Weight: 175 grams