how come i was sent a 929 when a f999b is what i should have gotten, all over this page says f999b,invoice says f999b, it dosnt seem fair

As some one who just got fired from Amazon I think you get a refund and buy it at any place as long as its not Amazon.

How far can you be from the microphone and still hear?

Never worked, and the cost to send it back, and paperwork, is understandably why they can sell defective products, and not have to worry about refunds, or merchandise returns. Totally Dissatisfied

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New F999B Super Sensitive Listen Thru-wall Contact/probe Microphone Amplifier System (Warranty period of five years)

New F999B Super Sensitive Listen Thru-wall Contact/probe Microphone Amplifier System (Warranty period of five years)

Product ID: 40506837

Details

Brand
Kstpower
Color
silver
Connectivity Technology
Auxiliary
Connector Type
3.5 mm Jack
Included Components
amplifier card
Model Name
F999B

🎧3.5mm stereo headphone output

📡4 audio channels (1200Hz, 800Hz, 200Hz)

🔋24h continuous monitoring battery life

$312.76

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Description

🔍 Hear what others can’t — the ultimate pro-grade listen-thru-wall system!

DISCREET DURABLE - Robust metal housing built for professional-grade durability
ALL DAY SURVEILLANCE - Up to 24 hours of continuous monitoring on a single charge
UNMATCHED SENSITIVITY - Hear through concrete, metal, wood & more with -70dB mic sensitivity
MULTI FREQUENCY CLARITY - Four audio channels for crystal-clear sound detection
PLUG PLAY COMPATIBILITY - Seamless 3.5mm jack connection for smartphones, laptops & more

The F999B Super Sensitive Listen Thru-wall Contact/Probe Microphone Amplifier System delivers industry-leading sensitivity with -70dB microphone precision and 20,000x gain amplification. Designed for professional surveillance, it penetrates solid surfaces like concrete, metal, and wood, offering up to 24 hours of continuous monitoring powered by a rechargeable lithium battery. Featuring four audio channels and a 3.5mm headphone output, this rugged metal-encased device ensures discreet, high-quality audio capture compatible with a wide range of devices. Backed by a 5-year warranty, it’s the go-to tool for serious investigative professionals.

Specifications

ASIN	B01L9AMY9Y
Antenna Location	Investigation, Surveillance
Audible Noise	70 Decibels
Audio Sensitivity	70 Decibels
Best Sellers Rank	#309,150 in Electronics ( See Top 100 in Electronics ) #1,768 in Audio Component Amplifiers
Brand	Kstpower
Built-In Media	amplifier, battery, warranty card
Color	silver
Compatible Devices	['Smartphone', 'Laptop', 'Personal Computer', 'Tablet', 'Camera', 'Headphone', 'Radio', 'Speaker', 'Karaoke Machine', 'Amplifier', 'Gaming Console']
Connectivity Technology	Auxiliary
Connector Type	3.5 mm Jack
Customer Reviews	3.4 out of 5 stars 26 Reviews
EU Spare Part Availability Duration	5 Years
Enclosure Material	Wood
Frequency Response	20 KHz
Impedance	32 Ohms
Item Dimensions	9.06 x 7.09 x 2.76 inches
Manufacturer	Kstpower
Mfr Part Number	F999B
Microphone Form Factor	Mini
Model Name	F999B
Model Number	F999B
Number of Channels	4
Polar Pattern	Omnidirectional
Power Source	Battery Powered
Recommended Uses For Product	Investigation, Surveillance
Signal-to-Noise Ratio	70 dB
Special Feature	3.5mm jack
UPC	723800422475

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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$312.76

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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