how to: Mouse only, no pictures?

Hello,I'm running on my own serverWordpress 4.2.2WP-reCAPTCHA 4.1While I'm logged in as an administrator I`m able to click "I'm not a robot".The circle spins, and the green hook apears. Everything is fine.BUT when I'm not logged in I`m asked to click on pictures.How to disable the picture question and use mouse only?thus pictures are not working on my Android Tablet, the are cut off.regardsErik -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.