12V3A power adapter 3000mA monitoring camera video top box LCD display LED screen light therapy charging line DC12 volt dual line direct current switch general 2.5A2A
景赛12V3A电源适配器3000mA监控摄像机录像机顶盒液晶显示器LED屏光疗机充电线DC12伏双线直流开关通用2.5A2A