HEADPHONES WIRELESS A4TECH, Bluetooth w/microphone, Mint Green B20

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A4Tech B20 2Drumtek True Wireless Earphones True wireless stereo · Bluetooth 5.2 · 13mm drivers · Up to 20 hours total playback The A4Tech B20 2Drumtek true wireless earphones feature 13mm speakers, Bluetooth 5.2 connectivity, integrated microphones, and a charging case that provides approximately 20 hours of total playback at 50% volume. Key Features 13mm speaker drivers: Deliver audio across a 20Hz–20kHz frequency range. Bluetooth 5.2: Provides wireless connectivity with an operating range of up to 10 metres. Built-in microphones: Designed for voice calls and other two-way audio applications. Portable charging case: The 380mAh case provides approximately 20 hours of total playback at 50% volume. Compact and lightweight design: Each earphone weighs approximately 4g, while the total weight is approximately 39g. Audio Specifications Speaker size: 13mm Frequency response: 20Hz–20kHz Earphone sensitivity: 102dB at -10dBFS Microphone sensitivity: -42dB at 1kHz/Pa Earphone impedance: 32Ω Wireless Connectivity Bluetooth version: 5.2 Operating distance: Up to 10m Connection type: True wireless Battery and Charging Earphone battery: Lithium battery, 40mAh Charging case battery: Lithium battery, 380mAh Charging power: 5V / 500mA Earphone charging time: Less than 1.5 hours from low battery to full charge Case charging time: Less than 1.5 hours from low battery to full charge Music playback per charge: Approximately 5 hours at 50% volume Total playback with charging case: Approximately 20 hours at 50% volume Physical Specifications Weight per earphone: 4g Total weight: 39g