Casti fara fir RAZER HAMMERHEAD TRUE WIRELESS EARBUDS TECH SPECS Bluetooth wireless range: Up to 10m / 30 ft Battery life: Earbuds 4 hours and 12 hours additional with charging case* Charge time: Up to 1.5 hours Drivers: 13 mm * May vary dependent on usage Headphones Frequency response: 20 Hz – 20kHz Impedance: 32 ± 15% Ω Sensitivity: 91 ± 3 dB @ 1 kHz Max input power: 8mW Drivers: 13 mm Approximate weight: 45.0 g Microphone Frequency response: 300 Hz – 5 kHz Signal-to-noise ratio: ≥ 55