This anti-spy detector can find wireless signal devices from 100Mhz to 8Ghz, including most WiFi devices like spy cameras or hidden cameras. The sensitivity is adjustable in 5 levels, which can flexibly respond to different scenarios and meet your individual needs. Price drops from $49.99 to $39.99 to just $17.59 when you clip the 10% off coupon on the product page and add the code "HKUBLVXL" during checkout. Shipping is free for prime members or on orders over $35.