Features: 1. Qualcomm chip and dual-antenna design doubles the transmission range and makes the connection more stable. 2. You can enjoy a seamless listening experience even under electromagnetic interference such as gyms, train stations and airports. 3. With optimized accidental activation protection, you can precisely adjust the volume, skip tracks, play or pause music. 4. The bass adjustment has strong power, extreme depth and rich layers, while ensuring clear vocals and crisp treble. 5. The Bluetooth headphones are made of ABS material, which makes them stable and has a long service life. Item Type: Bluetooth Headphones Material: ABS Chip: ChinaCacheSupport: A2DP decoding Receiving distance: Approx. 10 m / 32.8 ft Headphones built-in battery: Lithium polymer battery Built-in battery capacity: 50 mAh Charging box built-in battery: Lithium polymer battery Built-in battery capacity: 500 mAh Charging box built-in battery specification: 902030 Working voltage: 3.7 V (3.3 ~ 4.2 V) Charging time: <= 2 hours Standby connection time: >= 100 hours Music playing time: >= 3 hours Microphone sensitivity: -42+-3 Working current: <= 13 mA—PA