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Cayman 401 (403) Non-linear Junction Detector

The key difference is lack of telescopic bar. This model is especially helpful when working in confined space, checking small cargo and mail, as well as inspection of people.
Cayman 401 (403) Non-linear Junction Detector
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SKU: Cayman 401

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Non-linear junction detector Cayman ST-401 (403) is compact modification of base model ST-400 (402). Cayman 401 (403) supports all operation modes, applicable in base model 400. The key difference is lack of telescopic bar. This model is especially helpful when working in confined space, checking small cargo and mail, as well as inspection of people. ST-401 (403) allows detecting and precise localizing both working devices and even turned off ones. Using this non-linear junction detector operator is able to distinguish natural semiconductor from the artificial one (metal, corrosion, metal-oxide-metal structure). 

 Competitive advantages:

 Main distinctive feature of non-linear junction detectors CAYMAN is multifrequency irradiation mode, which provides wide range of advantages in front of detectors designed by the classic scheme:

  • increased selectivity (ability to distinguish electronic components with background of metal-oxide-metal structure);
  • increased probability of detection electronic devices behind partially shielded surfaces (such as the grid "netting");
  • optimal ratio of radiation power and detection range;
  • ability to identify detected objects in Audio mode;
  • high detection sensitivity at a low output power;
  • ability for effective operation in complicated interference environment (reinforced structures, corrosion, etc.).

 Updated model has beneficial differences from the last modification:

  •  modernized antenna, which increase detector selectivity;  
  • reduced weight and overall dimensions of the device;
  • simplified system of control and indication;
  • use of common power supply batteries;
  • more ergonomic design. 

 Additional features:

  • original signal processing algorithm enables to reduce false responses  and increase the selectivity as well as reaction speed;
  • software upgrade via USB;
  • detector is supplied in shockproof package.

Cayman 400 Technical Characteristics: 

Frequency range

2-3 GHz

The maximum radiated peak power

Less than 2W

Antenna polarization


Operating modes

“search”, “audio”, “adaptation”

The range of sensitivity adjustment in manual mode

40 dB (5 steps of 8 dB each)


- visual

three 16 LEDs bars

- audible

built-in speaker, headphones

Power supply

2 Li-ion rechargeable batteries 3,7V (18650 type)

Run time of a fully charged battery

2-3 hours (depending on the operating mode)

Charge time

not more than 3 hours

Operating conditions

- temperature

+5 ... +40 C

- humidity

not more than 85% (at 25 C)

weight with battery

0.85 kg

Dimentions when folded 
(lenght, width, height)

220x130x95 mm

Weight of the full set

up to 3.7 kg

Height 130 mm
Width 220 mm
Thickness 95 mm
Weight 0,85 kg (with battery)
Case Plastic
Power supply 12
Frequency band 2-3 GHz
Battery life 2-3 hours
Battery charging time up to 3 hours

Delivery set: 



No. in Figure

ST 401 CAYMAN non-linear junction detector



Rechargeable battery 3,7V of type 18650



Power supply charger



Charging unit






Semiconductor simulator (red marking)



Metal-oxide-metal structure simulator (blue marking)



Operation manual



Transportation shockproof package





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Shipping & Returns


Notice: When audio waiver is required, on some items, please allow an extra 3 days for custom build and testing before shipping, which includes next day orders. If this is a problem please call us for speed options and we will do everything in our power to help expedite your order along. 

Audio devices may not be used to violate the privacy rights of others. In no way will Spy Associates or its subsidiaries or partners be held responsible for inappropriate use of these products.

*What does Must Sign Audio Waiver Mean?

You'll notice on some products that have an audio option, we require a signed waiver sent back to us once your order is completed, if you are within the United States, and the product is to be used solely by law enforcement, government, or an international shipping location.

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Your Order will be given to the shipping carrier the same day you place the order, not including national holidays & weekends. Any order placed after 2pm weekdays or on Saturday / Sunday will be shipped out the next business day.

Some custom built products may require up to 48 hours, which includes custom audio add-ons that may require 72 hours. You will be notified of any delays as soon as possible.

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YES! We ship worldwide. On International Orders, any CUSTOMS FEES are the responsibility of the purchaser NOT SpyAssociates. Every country's import rules are different, so it's impossible to guess how much, and if any fees may apply.

Return Policy

We test all of our products before shipping to ensure they are in working order.

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All products which are special ordered by the person ordering and are NOT subject to cancellations. Due to the nature of our product line, returns will only be accepted for products damaged upon shipment to the customer*. All returns must be authorized by before product(s) is returned. will replace, refund, or credit your account for returned product(s) at's discretion. We have been forced to implement this policy because of the attraction of our products to unscrupulous people who return products after they have profitably gained from the short-term use of the products.

*Special exceptions may be made on a case by case basis determined by In this event, returns are subject to deductions for shipping costs and a 25% restocking charge and must be returned within a ten (10) day period from date of receipt of product(s). NO refunds will be given for products returned without explicit permission from

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We at strive to offer our customers the best products at the best possible prices. Due to the nature of the products, returns will not be accepted unless the product is found to be defective or unless otherwise explicitly stated on the specific product page.

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Every product receives FREE LIFETIME SUPPORT. We guarantee all products to be free of defects in workmanship and material for 90 days (some manufacturer's warranty is one (1) year or lifetime - please see info on the page for specific product's details) after sale to the customer. We will replace or repair the product(s) at our option providing there is no evidence of customer misuse, or alteration.

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