1No need to bind the APP, you can call directly. Free to call. 2Solve the weak signal, such as unable to connect to the network problem. 3Multi-functional watch, it contains 7 puzzle games for fun. Maximum support 32G of memory, also support play music. 4Two-way call: the watch can talk to any watch. 5With hd camera, allow kids to easy capture beautiful pictures and record.Screen: 1.54 "capacitive touch color screen 240x240 pixels Chip Solution: MTK6261D, main frequency 260MHZ GSM: 2G quad-frequency (850/900/1800/1900) SIM card: Mirco SIM card, Flip, mobile or unicom card. Time display: the watch automatically updates the time after inserting the card, no need to manually Two-way call: the watch can talk to any watch Dial: the watch can dial any phone Camera: 30W Recording: support Mirco Storage card: supports 32G Music: support to play external Mirco storage card MP3 music format Games: built-in 7 children's puzzle games Battery: 380mAH lithium battery Size: Approx.52.5 x39.5 x14.5 mm/2.1x1.6x0.6in Color: pink/yellow/blue/black 1x Watch1x USB Cable1x ManualNo APP is required for this watch.