Hello. Please do not worry. Your laser machine is working. We check each laser before shipment.
Please perform several actions:
1. Check that you have written «AA» on your batteries
If the batteries say «AAA» — these batteries are not suitable.
Use only «AA» batteries!
2. Make sure that your batteries are not dead. Buy a new battery pack..
3. Insert the batteries correctly. Observe the polarity «-» and «+»
4. If you did everything according to items 1-3 but the laser does not work — please spin the batteries for better contact between them.
The power supply unit has a voltage of 220 volts and is not supplied for America