* Please strictly abide by the relevant national laws and regulations, DO NOT use it for any illegal use, otherwise it may take consequences .
* About the battery; If haven't used ina long time, please charge before using, and charge it at least once a month.
* Working temperature: 0~45℃
* Work humidity: 20%-80%
* This item are precision electronic products, do not make it subjected to strong impact, vibration, do not use in the strong magnetic or strong electric field.