GoerTek Portable Hand Held Metal Detectors Wand, Security Sensitive Super Scanner Three-Color Indicator, Light-Weight to Carry Around 9V Battery(Included) Detecting Temperature Range -15~45 Celsius Detecting temperature range is -15 ~ 45, fast detecting and high sensitivity, large detecting probe area. Two ways to alarm : You can choose either an audible tone or vibration. Three-color indicators: Green for power, Yellow for under-voltage, Red for alert. Powered by one non-rechargeable 9V battery (included),with an external charging port, you also can fully charge it with a rechargeable 9V battery (not included). Easy to carry around: with a wrist strap, low weight, compact and generous appearance.