Abcon 9v DC 0.4A RH-90040ZZ Reverse Polarity Power Supply Adapter PLUG
Good working order.
Abcon 9v DC 0.4A RH-90040ZZ
Output: 9v DC 0.4A 400mA 9W
Reverse Polarity (Centre Negative)
Check the polarity of your device.
9V centre negative (Reverse Polarity) 400mA power supply.