- Function:<br />Line status test<br />DC level detection circuit and to determine positive and negative polarity<br />Telephone ring bell signal flow detection<br />- Power: 2* DC、 9V batteries (included)<br />- Maximum operating current: transmitter: = 20MA、 receiver: = 100MA<br />- Signal transmission format: multi-frequency pulse<br />- Signal level reported: 8vp-p<br />- Signal transmission distance: = 3km<br />- Package contains:<br />1* Transmitter<br />1* Receiver<br />1* Earphone (2.5mm tip、 110cm cable length)<br />2* RJ45 cable (17.5cm length each)<br />2* RJ11 cable (16cm length each)<br />1* 2-in-1 alligator clips (19.5cm length)<br />1* manual<br />1* Travel bag<br />                                                                                                                                Dimensions: 0 in x 0 in x 0 in<br />Weight: 19.01 oz