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Spytec F-999B Highly Sensitive Audio Wall Probe with Amplification up to 20000x Monitor 100 Hours
Cautions The indicator light works when it is charging please shutdown in case of damaging the machine. It needs to charge for about five hours. The sounder must smoothly stick to the wall`s surface; never move the sounder when you are sticking it to the wall in case of damaging the sounder. The effect of the monitoring depends on the thickness, materials and other features of the wall. Appropriately adjust the gear-choice button until you can get the best effect of monitoring. D is the partition monitoring boogie of the sounder is the refined part which should not be dismantled or touched discretionary. Specification Electric Current Exhaust 10mA Battery type 3.

Price is $113.00
Price: $113