Instruction: It was put theinfrared camera inside of the button of the T-shirt but the player could operate withanalyzer with this button. Description: 1.It is a true button on the T-shirt,but can help you to operate with poker analyzer. 2.4 cameras inside of the button,expand the range of scanning,good effects. 3.Hidden and saftey. 3.Distance:1.From 25-35 cm 2.Estimate working hours: About 1-2 hours Specification:The button lens is composed of four cameras inside, 2 batteries and a charger.