Gl-AR150 Mini Router not able to set up

i bought the mini router gl ar150. I pluged in the USB cable into the power port as described in the instruction paper. A green light in the middle (configuration) is flashing up for a second but nothing more happend. It seems that this device is not working! What is the problem?
Please help.

Seems the router does not boot up. The 3rd LED should light up indicating wifi.

Pls change a different power adapter and power cable to see if it work. If you are sure the power is OK. It may be a fault router.

insufficient power going to the ar150