Red LED Indicator lights when the Metal Detector detects metal 
Earphone Jack lets you connect an optional earphone to the security wand so you can scan in privacy
Sensitivity: A 25-cent coin: 2.5 inch(0.6 inch)
Iron pipe-tube in 20mm: 4 inch(1.2 inch) 
Adjustment: Continuous
Alert: Audio, LED light, Vibration(for TS90A) 
Power: 9V battery (6F22) 
Dimensions(W×L×T): 80×420×40 mm
Weight: 430g (with battery)