Specifications Category: Earphones & Headphones Style: TWS In-Ear Headphones Material: Plastic Weight: 44 g Color: Black (default) Battery Capacity: 400 mAh Battery Life: Up to 36 hours Charging Method: Charging case Driver Diameter: 13 mm Number of Drivers: 2 Impedance: 32 Ω (up to 32 Ω range) Sensitivity: — Frequency Response: 20 – 20,000 Hz Total Harmonic Distortion: 1% Max Output: 10 mW Wireless Type: Bluetooth Communication: True Wireless Wireless Range: Less than 10 m Sound Isolating: Yes Resistance: 32 Ω Origin: Mainland China Brand Name: TRANSFORMERS Features Active Noise-Cancellation for immersive listening With microphone for calls and gaming Playback control with volume adjustment Dynamic vocalism principle for balanced sound True wireless design with Bluetooth connectivity Suitable for video games, mobile phones, HiFi audio, sports, outdoor, office, and study use Package includes: User Manual, Charging Case, Charging Cable, Replaceable Pads Set