From the Manufacturer: Stereo wireless earphone with built-in Microphone Support hands-free calls Easy to control for media and phone calls NFC and bluetooth 4.0 Brand: Ausdom Model: M04 Sensitivity: 90±3dB S.P.L at 1KHz Speaker Diameter: Φ40mm Frequency Response Range: 20-20000Hz Microphone: Yes S/N Ratio: 80dB Distortion: 0.3% Standby Time: 250 Hours Working Time: 20 Hours Charging Time: 2-3 Hours Talk Time: 20 Hours Music Playing Time: 20 Hours Speaker Impedance: 32Ω Power Supply: 400mAh Bluetooth Version: 4.0 Working Temperature: -10℃- 45℃ Operation Current: 25mA Max. Input Voltage: 4.2V Rated Power: 20mW Transmission Power: 2.5mW Transmission Distance: 10m Audio File Format: MP3 Material: ABS & Stainless Steel & Imitation Protein Holster & Memory Foam Compatible with: Mainstream Bluetooth Devices USB Cable Length: 1m Audio Cable Length: 1.5m Dimensions: (7.80 x 6.89 x 1.10)" / (19.8 x 17.5 x 2.8)cm (L x W x H) Package Includes: 1 x Ausdom M04 Head Wearing Bluetooth Headset 1 x Micro USB Charging Line 1 x 3.5mm Audio Cable 1 x Manual
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