Model:MD-5002 Power Supply: 8pcs 1.5V Batteries in Series Emitting Frequency: 6.99KHz Signal Frequency: 437KHz Indicators: Visual: Lever Meter Sound:2"Speaker or Earphone (Earphone not included) Function: Disc: Ground Balanc; Distinguish Ferrous and Non-Ferrous Metal Controls: Critical Sound Tuner; Function Tuner ; Operating Current: 300mA MAX at MAX Volume The Detecting Depth (Max): 1.5-2 Meters Sensitivity: 25-30cm for a US(25cent) Export Packing: 4PCS /Carton 0.1736CBM (63*32*85cm) 14.5kg/Carton Color: Black Certification : EMC Certification