Specifications:Model: XQ-350Color: OrangeMax working current: Tester: 10mA Receiver: 30mASignal transfer mode: Multi-frequency pulseSignal output level: 8Vp-pSignal transfer distance: 3KmBattery: 1 x DC 9V Battery (NOT included)Size: Transmitter: Approx. 126*50*34mm/4.9*1.96*1.3in Receiver: Approx. 178*40*25mm/7*1.57*0.98inWeight: Approx. 326g Features: This cable tester is suitable for RJ11 RJ45, judge continuity of the cables or wires. Rapidly find the target wire from among plenty of network, telephone wires. Compare the volume of the "tout" sound and the brightness of the signal indicator, then you can find the target wire which has the highest volume and brightest indicator. It comes with an earphone support to enable service technician to work conveniently and comfortably in noisy environment. Sensitive sensor, stable and reliable.