Universal Smartphone Binocular Adaptor Mount Connector with Telescope and Cell Mobile Phone for Different Size Eyepiece

Found fixing to phone difficult,not yet taken rubber eye piece off binocular to see if it fits

Pretty poor grip. Needs to be tight so as not to fall off but then when you tighten enough the jaws jump out of their track and it suddenly fails totally.Add to this the cheap plastic construction and I'd say it was just "ok" but cannot be bothered to return it.

easy to use, used it on microscopes as well as my telescope.

Impossible to use as it covers the power off switch