1. If your monthly electricity bill is less than 800kwh($100/100)Euros, using one powersaver will save electricity and lower your monthly bill.
2. If your average monthly electricity bill runs over 800kwh($100/100)Euros, you will need two Powersaver for optimum savings.
3. Our powersaver has been tested and approved by the CE
4. Our powersaver has been tested and approved by the UL
5. Our powersaver is conformance Europe RoHS command
6. Four colors as per your like