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Earphones parameters: Bluetooth profiles:HSP, HFP, A2DP and AVRCP Effective distance:10 meters (equal to 33 feet) Built-in 65mAh lithium battery Frequency range:2.4-2.48GHz Frequency response:100Hz-20kHz Distortion:≤1% Microphone sensitivity:-40db Music time: 3-4 hours Standby time:120 hours Built-in lithium battery:65mAh Charging port:Micro USB Charging time:Approx 1-2 hours Unit weight:Approx 20g Cable length:55CM packaging size:118*80*52mm packaging: 1*headphones 1*USB Cable 1*User ManualThank you for your browse.If you need any help or give us any advice,contact us anytime.Hope to see your shares on SNS platforms and let more customers know our products.For your convenience, please search "TechCode + your product" to take the fastest way to buy other products you want and have a clear view of other products we offer in store. Thank you very much.