This means you can leave the AC power cable behind and only plug it in to the mains power when you need to recharge the batteries.
这意味着你可以离开空调的背后，仅电力电缆的水管堵塞，在当你需要电力充电。
2
Mains and external signal cables longer than 10 m shall in areas where lightning is frequent be protected with an external lightning surge protection at the cable entrance to the building.
主线和外部信号线超过10米的，在线进入大楼的入口处时设置避雷保护，避免雷击。
3
Every repeater unit is supplied with a mains power supply unit with a 1.9 metre cable.