Soundz Wireless Bluetooth Headset With Built-in Battery with Case BLUETOOTH HEADSET: Using Bluetooth technology the range of up to 10 meters with a built-in microphone and controls for a hands-free experience. PATENTED SPEAKER TECHNOLOGY: This delivers exceptional Bass and crisp tones, these fine-tuned acoustics allow you to get lost in your favourite sounds COMFORTABLE OVER-EAR HEADPHONES: Soft, noise-cancelling PU leather ear cups provide comfortable listening experiences for long periods of time. The ear cups also provide great isolation to enhance your music sound. FOLDABLE DESIGN: The fully foldable design gives it exceptional, easy portability. Lightweight too, making it the ideal travel companion. Features: Built-in Microphone with noise-cancelling technology. Driver Size: 40mm ; Frequency response: 20Hz - 20 KHz. Impedance: 32 Ω ; Power: 0.25W*2. Operation distance: 10M; Battery Capacity: 300mAh rechargeable polymer lithium-ion battery. Charging time: 3 hours Operating time: approximately 4 hours Standby time: approximately 300 hours. Box Contains: Soundz Wireless Headset with battery case