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Note: Gray is an unpopular color and is not available as a regular color If you need to specify gray, please contact Wangwang or leave a message after placing an order Please inquire about stock availability in advance. Contact Ma Sheng at 18028775715 Internal Magnetic Speaker Pure sound quality and strong battery life Factory Direct Sales There is a price grid based on quantity, and mixed batches are supported Basic Parameters Bluetooth version: V: 3.0 Frequency: 2.402-2.480GHz Maximum output power: 3W MIC sensitivity: -38db Sensitivity: Better than -82dBm Distance: 10-30 meters Charging voltage: 3.7V –4.2V DC Operating Voltage: 4.8V –5.5V DC Working current: 150MA Quiescent current: >1UA Battery: 300mAh