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Homtime C2 Alarm Clock with Dual USB Charger Powered by power adapter or by AAA battery Backup PowerConnecting the USB power cable(included) with the power adapter(not included), plug the power jack into the alarm device to turn on the alarm clock.-Installing 3pcs AAA battery(not included) to turn on the device. It does not support USB charging in battery mode.Reasons Why the Vibrator Does Not Vibrate 1. The transmitter is not inserted, or the transmitter is not inserted properly2. The vibrator has no batteries or the batteries are empty (3 3A batteries can be used for 6 months) 3. The vibration frequency adjustment button(alarm sound adjustment button) is not vibrating in the minimum state 4. The radio interference is too large, which will cause the receiver inside the vibrator to lose contact with the transmitter behind the machine and does not display the vibration symbol.Corresponding Solution 1. Unplug the transmitter and re-insert it into the back of the device 2. Install or replace the battery 3. Set the button for adjusting the ringtone on the back of the device to the maximum alarm mode 4. Long press the small hole in the vibrator 5 seconds, a vibration symbol will appear on the screen, indicating that the reset was successfulTechnical Specification-Material: ABS Injection Plastic-Working Voltage: 5V-Battery Type: AAA Battery(Not Included)-Dual USB Charger: 2 x 1A-FCC certified