12V DC 1A Power Supply Adapter 110/220 12 V Volt 12Volt Wall 1000mA 1 A Amp 1Amp

  
It has a 2.1mmx5.5mm tip which is standard for most applications. You can choose from 1, 3, 5, 10, 20, 50 and 100 pcs.

Also has a green led light to indicate it is on.