Adjustable pick-up loudness control. Headset combined with ear padding to cut out background noises. nterchangeable - 2 Probe heads (60mm and 290mm lengths). Strong probe body, black ABS molding. 9 Volt alkaline battery for about 30 hour's continuous operation. When any gas or liquid through a leak pore, have a high-frequency components can be detected. Can be used to measure water tank tightness, pipe, frozen air conditioning pipe leakage. With electronic stethoscope earphone, the user be to operate to detect leak. Through headset can hear leak of rapids or instructions. The closer detector is to leak, the greater jerk sound. Frequency Range: 100Hz-10kHz. Input Impedance: 15MΩ. Ambient Noise Permitted: 100dB. Working Temperature: -10-55℃ Power Supply: 9V(6F22) battery Colour:Black Material:ABS+Metal Package Contents: 1 * Electronic Stethoscope 1 * Earphone 1 * Short Probe 1 * Long Probe 1 * Bag 1 * Instructions in Chinese and English Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.