sensitivity: 200 sensitivity levels for each zone for precision detection of target objects. calibration: automatic calibration. No initial or periodic calibration necessary.  detection zones: 27 overlapping detector zones. Detects ferrous and non-ferrous. indicators: a) adjustable audio indication. B) led bar graph signal strength indicator c) high bright led zone display d) large lcd display for counting and message annunciationinterference rejection: high immunity to external electrical interference, such as x-ray machines, computer or cctv monitors detected. memory: parameters stored in non-volatile ram so no loss of settings as a result of power failure or turning off the unit. traffic counter: microcontroller based intelligent lcd counter to indicate in, out and algebraic sum of the traffic. It also keep a track on number of alarms and alarm percentage.  power source: smps 90-270v ac & 12v/7ah battery seamless battery changeover in case of mains failure batteries are internally & automatically charged during operationbattery backup: integral rechargeable battery with built-in charger to cope with power failures of over 12 hours construction: weatherproof rugged structure made with detachable abs laminated side panels for ease to install & transportation. Abs plastic boots for panel protection. temperature: -20deg c to +55deg c & humidity of 95% non-condensingweight: 70kgs (approx)password protection: password protection to prevent tampering of settings