Native Wireless device, Operates on Li-Ion 6000mAh Rechargable Battery. GSM Based Technology- SMS & CALL Control. Notification of Battery, System Status, System ON OFF by SMS & CALL. Battery backup of 6-8 days.* High accuracy. (99% )* Made of mild steel with powder coating, temper proof and has long life. One-Way key, so duplication of key is avoided. Facility of entry & exit delay. Compact device. Easy to operate & install. Can be fixed anywhere in 10 min