... control. Introduction,VAS is a complete GSM/GPRS/GPS Vehicle Alarm system which can protect all type of cars, trucks, taxi ... with sound and light alertOther useful functions- Built-in internal backup battery,After Power Failure Alert, the back-up battery ... Control Distance, 100M - Mainframe Power supply, 12 or 24V DC- Backup battery, Poly-Li battery, 600mAh 3.7V - Mainframe Dimension, 125x108x26mm ...