cannot airdrop between my iphone6 and macbook air

I cannot see my iphone6 on my macbook air (Finder->Go->AirDrop), nor I can see my macbook air on my iphone6 airdrop list.

Strange enough, I cannot see anything like "‘Allow me to be discovered by’ option" in the airdrop window.

I have disable firewall on my macbook air, and turned on both bluetooth and wifi.

For my iphone6, I turned on airdrop (both bluetooth and wifi is on), and set to allow everybody.

My macbook air is 11-inch, early 2014, running OSX version 10.9.5

My iphone6 is a plus, running ios 9.1 (I have no problem on airdop to other iphone)

I searched on web and seems no one has the same problem?