兩者合起來聽好用

This one, sometimes you can get it around $150 on newegg
http://www.newegg.com/Product/Product.aspx?Item=N82E16881377046

http://www.homedepot.com/p/Heath-Zenith-180-Degree-Outdoor-Motion-Sensing-Security-Light-SL-5412-WH/100645218#.UiYgBtK1Hao