Pro Detector MD-1008B Children Learning Metal Detector Machine Features:1. LCD display2. Light weight and easy operation3. Sensitive Control Power: 9V battery,Frequency: 55.3KHz,Current: Standby: 20mA Max: 70mA Voltage: 7V-9V,lndication Mode: Sound Mode LCD Mode Sensitivity: One Coin: 10mm Stretch Length: 6.1 inches Detector Diameter: 6.77 inches