Transmission range: Name: XG-12 Bluetooth TWS Dual HeadsetColor: black, whiteSpeaker specifications: 8 miles of true copper ring rubberSpeaker impedance: 16 ohmsSpeaker frequency response: 20Hz ~ 20KHzSpeaker rated power: 3MWSpeaker 1k sensitivity: 98dbTalk time (medium volume): 3.5hMusic time (medium volume): 4hStandby time: 120hBluetooth chip: (Zhongke Lanxun solution) Bluetooth version: 5.0+edrTransmission distance (m): 7-10 meters Power consumption: 18-22 mAhInput power: 93mWHeadphone charging time: 1HHeadphone battery capacity: 55 mAhCharging battery capacity: 350 mAhCycle chargeable times: 3 times Charging time outside the charging compartment: 1.2HBattery voltage: 3.2-4.2v  Accessories: manual + data cable + ear capDouble eared bin packaging specification: 105*85*35mmSingle ear belt storage package specification: 105*85*35mmSingle ear USB package specification: 123*92*26mm