the small power supply unit can provide strong power continuously for long time, which can be the backup in order to avoid power cut situation. Small switching power supply is necessary for some companies because power cut would directly influence their work. The supply unit in our shop are of smaller size and lighter weight, which would be more convenient. And the switch electric is cheaper than the former model, which makes the switch electric supplier your perfect choice. Product Specification for "Baku Sophisticated Regulated DC Power Supply, BK 1502DD" ,Current Rating :2.1 amp Frequency :50 Hz Input Voltage : 220 v AC Model :BK 1502DD Output Current :0.6 A - 2.1 A Output Voltage :0-15 v Dc, Fix at 1.5 v, 3.6 v, 4.8 v, 6 v, 7.2 v Specifications :Voltage Stability: 0.01% + 2 mV, Recovery Time: 100 micro Second, Load Stability: 0.2 + 3 mA Temperature : Working: -10 degreeC to 80 degreeC Voltage :0-15.8 v Key. Features : DC Power Supply .let us resolve the issue to make up and meet your expectation. it's our pleasure to serve you and establish long and well business relationship with you.