Refurbished- PTron BT Boom 4D Bluetooth Headphones With Mic For Oppo F15 (Red & Black) Highlights: Design: Piston In-Ear Sports Bluetooth Support: Yes wireless Driver Type: PU+Drum paper mix which provides high bass Controls: Volume & music controls Mic: In-line Ergonomic design & high grade silicone ear muffs External noise cancelations Compatible With: All smart phones & tablets Specifications: Driver Type: 9mmx2+9mm*2 PU+ Drum paper mix film Frequency Response: 20Hz - 20kHz Speaker Impedance: 16Ω ±15% Speaker Sensitivity: 100±3dB/V@1kHz Mic Sensitivity: -40±3dB@1000Hz Distortion: 3% At 1kHz Channel Balance: <3dB @ 1kHZ Connectivity Features: Bluetooth: v5.0 Bluetooth Range: Up to 10m from the paired device Battery: 70 mAh Max Input: DC 10V Charge Time: 1.5 hours(maximum) Standby Time:100 hours Playing Time: 3 hours depending on the volume level Talking Time: 3 hours Charge Port: Micro USB Description: Powerful dual dynamic drivers for stereo sound quality. A high level of sound isolation for audio with high bass response. Conforms to the shape of the ear for comfortable and secure fit. The memory wire securely holds its shape so the earphones won't fall out on-the-go. Disclaimer: Product color/texture may slightly vary due to photographic lighting sources or your monitor settings or mobile settings.