Sennheiser’s HD 4.40BT Wireless headset offers great sound quality for every day listening on the move. Long-lasting battery life and a robust, foldable design, the closed back around ear headset is the perfect companion for your mobile devices – providing you with unrivalled listening pleasure and easy communication.
Impedance: 18 Ω
Frequency response (Microphone): 100 – 10,000 Hz
Frequency response: 18 – 22,000 Hz
Sound pressure level (SPL): 113dB (Passive: 1kHz/1Vrms)
THD, total harmonic distortion: <0.5% (1kHz/100dB)
Pick-up pattern: Dual omnidirectional microphones
Battery Specification: Li-ion Polymer Battery