from brand maker Scalable earphones Ergonomic design，user friendly operation for easy control Support Music format: MP3/WAV/WMA With extended slot for TF/Micro SD Card Easy connection with PC/Laptops, no driver needed Built-in 8GB memory Continuous working Time: 4-5 hours Built-in Lithium-ion Polymer Battery: 5V DC, 500mAh Power consumption: <0.4W Operation Temperature: 0℃-60℃ Storage Temperature: -20℃-80℃ Necessary equipment or device recommended highly for polices, journalist,
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