Specifications: Frequency range: 20~20kHz; Microphone sensitivity:-54±2dB; Operating time: 10±0.3 hours; Standby time: over 60 days; Input: DC5.0±0.5V, Max500mA; Battery: Li-ion battery capacity 3.7V 350mAH. 2, Using the Headphones Fix the ‘Sound pick up’ on the collar or shirt packet with ‘Wear clamps’. Switch on the headphone (On/Off). Adjust the volume to be appropriate(both side). Note: if the squeak is happening, please switch off the headphones first, then adjust the both volume to minimum, switch on the headphone again, and adjust the volume higher to appropriate again. 3,Charging When the red LED on the ‘Indicator light’ is lit, the build-in battery is less than 20%. Please charge it using the micro USB wire in the package. Input power is 5±0.5V. Please use the 5V power adapter which conform with national safety standards. Note: The charging time may not be more than 24 hours. 4,Storage and maintenance When the headphones is not in use, turn off the power. Can use a clean, soft cloth daily clean the whole device. Note: the pickup box is not water proof design. So do not use wet cloth to clean this part. Particularly, The chemical solvent cleaning can not be use! such as: pure alcohol, acetone, etc.
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