DIY Wireless Security System - Easy to install and ready to use, no programming is required. Rolling Code Technology - Leading edge technology, provides maximum security and reduces false alarm. Ideal for homes, apartments, convenience stores, gas station and condominiums. This system is good for most small to medium size house. For larger house, more accessories should be added in order to cover all the premises. Works in conjunction with up to 15 SkyLink security accessories. Arm/Disarm using Keychain Transmitter. Includes a piercing 110 dB siren. AC power with 9V Alkaline battery backup (included). Up to 100ft range. No monitoring fees. Color: White.