will this item detect cell phones? say in a prison like setting?

Yes, it will detect any cell phone that is transmitting (in use).

Does it detect gps trackers installed on a vehicle? by a car dealership? by a spouse?

It will yes as long as the GPS device is a live tracker. Some GPS are loggers , meaning they log the information for later retrieval. You should keep the car moving as well to search for any motion activated devices.Based on the unit provided by spyville

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KJB Security DD3000 Cell Phone and GPS Detector Simple that can Detect cellular devices up to 30 ft away

Product ID: 1158792

Details

Battery Life
18 hours
Brand
KJB
Connectivity Technology
Cellular
Display Type
LED
Human Interface Input
Buttons
Included Components
1 x Remote

📏30 ft detection range

📡Detects GSM, CDMA & WCDMA signals

🔋18-20 hrs battery life

Description

📡 Stay one step ahead—detect the undetectable with confidence!

DUAL ALERT SYSTEM - Never miss a signal with both vibration and audible alerts for stealthy detection.
COMPACT PORTABLE - Lightweight 0.45 lb design fits in your hand for discreet, on-the-go security sweeps.
LONG LASTING POWER - Stay on alert with up to 20 hours of continuous operation on a single charge.
USER FRIENDLY INTERFACE - Simple touch controls and LED display make counter-surveillance accessible to all pros.
MULTI BAND SIGNAL DETECTION - Pinpoint hidden cellular devices across GSM, CDMA, and WCDMA frequencies effortlessly.

The KJB Security DD3000 is a portable cellular and GPS detector designed to identify transmitting devices within a 30-foot radius. Supporting multiple frequency bands including GSM, CDMA, and WCDMA, it offers up to 20 hours of battery life with vibration and audible alerts. While marketed for professional use, user feedback highlights some limitations in detection sensitivity and build quality.

Specifications

ASIN	B004R6TVFI
Additional Features	Cellular Signal Detection
Battery Average Life	18 hours
Brand	KJB
Built-In Media	1 x Remote Control
Connectivity Technology	Cellular
Control Method	Touch
Customer Reviews	1.4 1.4 out of 5 stars (2)
Display Type	LED
Human-Interface Input	Buttons
Item Weight	7.2 ounces
Manufacturer	KJB Security
Map Types	Road
Mfr Part Number	DD3000
Model Number	DD3000
Supported Satellite Navigation System	GPS
Touch Screen Type	Resistive
UPC	738549222286

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