What generation is the product name 1566 of ipad air 2?

There is only one generation of iPad Air 2, iPad Air 2 WLAN model A1566; The model of IPad Air 2 WLAN+cellular network is A 1567.

IPad Air 2 A 1566 WLAN model A 1567 model:

(1) wireless network (802.11a/b/g/n/AC); Dual frequency (2.4GHz and 5 GHz); MIMO technology supporting HT80; (2) Bluetooth 4.2 technology.

Extended information iPad Air 2 for more information:

Year: 20/kloc-end of 0/4;

Capacity: 16GB, 32GB, 64GB,128gb; ;

White or black front frame;

9.7-inch retina display;

Silver, dark gray or gold aluminum metal shell;

Lightning interface;

Nano-SIM card holder is located on the right side of iPad Air 2 WLAN+ cellular network model;

FaceTime HD camera and iSight camera.

References:

Apple official website-Identify your iPad model.

References:

Apple official website -iPad Air 2- Technical Specifications