Extremely Sensitive Great for Security Monitoring Higher S Ratio Range:15 Square metres Sensitivity:200mA/ubar Work current :5mA-60mA Work Voltage:6-12V Frequency:200-6000HZ Speaker: waterproof,full frequency speaker. impedance:4OHM Voice coil: 16 core Magnet: single magnetic Power: 3W Input voltage:DC12V Colour:white Material:plastic Size:90 x 56.8mm Package Contents: 1 x Speaker Microphone Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.