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Built-in 8 GB Spy Camera Hidden Calculator Camera MINI Camcorder Video Recorder Category: Mini Calculators Cameras Short Description: Built-in rechargeable Li-battery, please insert the USB cable to the DVR wrist calculator firstly and then be in charging when the USB plug is connect with charger or inserted into the USB port of PC. Once connected correctly, the yellow light of this DVR calculator will be in work. When yellow light is stop fast flashing and the yellow and blue light is on, which means the battery is in full capacity, then stop charging.