This is a second handle for the EGO Power+ leaf blowers (only tested on the LB6500 but I believe it would fit the other similar models too). I found that, especially with the big 7.5ah battery, the blower is very hard to hold for a long time. Even with the shoulder strap, the second handle is helpful.
The handle is designed for quick installation and removal and simply uses 2 latches to attach it to the blower tube. There's a TPU "pad" to allow for a little squish so that it goes on tight.