Specification: 1: DC 5V (USB Power Supply) 2 Type: SMD 5050 three Color: RGB four : NO Battrey(CR2025) five product link includes four kind LED strip remote options: five 3Key controller: three Key controller ( NO Remote, NO APP). five IR controller: 44 Key Infrared Remote controller. ( NO APP). 5 Bluetooth controller: Bluetooth controller + Infrared Remote controller.(Can Use The Mobile App To Control The Light Strip) five Wifi controller: Wifi controller + Infrared Remote controller.(Can Use The Mobile App To Control The Light Strip) 6 Length: 1m=1roll 1m 2m=1roll 2m 3m=1roll 3m 4m=1roll 4m 5m=1roll 5m 10m=1roll 10m 15m=1roll 15m 20m=2roll 10m 25m=1roll 15m+1roll 10m 30m=2 roll 15m 7: Pleasse hold the arrow to arrow when u install the strip1 in your visiting on my shop!!! 2 there may be any question,feel unfastened to contact the seller. three a pleasant day!!