Guangzhou XL Technology Co., Ltd.is the first Chinese company which was granted a License for manufacturing, distribution, and service of casino and gamble cheatr and we supply products for : poker analyzer china|poker scanner|cards cheat|contact lenses|invisible ink|marked cards playing cards china|poker cheat|texas hold em cheat|omaha cheat|texas hold em poker analyzer china|omaha poker analyzer china 1. The best suitable situation is under the white light, especially the energy saving light. 2. Please make sure to wash your hands clearly before wear the contact lenses in case of infecting your eyes. 3. Before playing the poker games with contact lenses, it is better wear the glasses about several hours for adapting. Any more doubts,welcome here for free asking. Email:mhbiying160323@ Whatsapp/viber:+15102175824