1) Items included: training lamps (white) x8, appx1 (Android and IOS), nylon buckle x8, manual x1, EVA bag (black) x1, USB for portable charging x2. 2) Quality assurance: if you think there is something wrong with the goods, please contact us. After that, please let me confirm the product. If there is a problem with the product, it will send a new product. 3) You can search for ReactionX in Google or Apple Store，This application can be used for free, and we will continuously update the app 4) The maximum number of lights that can be connected depends on your phone, not all phones can connect to 8, only iPhone and iPad can connect to 8, other Android phones cannot use 8 lights at the same time. Please understand clearly before purchasing, Reaction training lamp product introduction: Reaction training light is a light training system controlled by mobile phone, which can train people's reaction speed, memory and spatial force. All modes of APP have different combination forms and playing methods. All data can be exported and classified. All parameters of app can be adjusted automatically. If the existing functions can't meet you, There is also a powerful programming mode to customize your training plan. This is a high-tech training equipment with ultra-high response accuracy: 0.01 seconds. Each lamp can be connected independently with long connection distance