4 1 5v battery listen through wall device

{"cid":"91149500","title":"1KHz 4\u00d71.5v Aa Battery 1mw Listen Through Wall Device","imgUrl":"https:\/\/img.chinax.com\/nimg\/e8\/75\/bca372a7c125ec991f011f59d8c3-200x200-1.jpg","attrs":{"Price":"USD1200-USD1800","Brand Name":"HEWEI brand","Model Number":"No","Minimum Order Quantity":"1 set","Delivery Time":"10-30 working days","Certification":"YES","Place of Origin":"Made-in-China","Payment Terms":"T\/T, T\/T","Supply Ability":"300 kits per month","Packaging Details":"carton package, 30*25*15cm","Power of Signal":"1mW","Frequency of Swing":"@1KHz,6 Db (attenuation) @300Hz,15 Db","Channel Attenuation Separation":">40 Db","Stereo Balance Control":"\u00b110 Db","Non-linear Harmonic Distortion Coefficient":">0.5%","Range of Amplifier Dynamic":">60 Db","Power Wastage (50% Volume)":"25mA","Battery":"4\u00d71.5V AA battery","External (PSU N\/A)":"9~12V @mA supply power","Headset":"0.6Watt, 300 Ohms","Dimension (mm)":"128\u00d799\u00d723","Weight":"About 0.5kg"}}