SenSci BlackOut Under-the-Leg Detector

Standard

Best for checking under a leg

$41.35$10.34 each

Price from our latest catalog update. Checkout, delivery and returns happen at our retail partner.

Catches what walks inNo lure in the box
4-pack$10.34 each, 4-pack
Price from our last updateThe partner checkout has the final price
Sold by our retail partnerDelivery and returns are theirs

What you get

Packs of 4.

How to use it

Place the monitor where a cup will not go: beside a headboard, under a sofa, by a nightstand.
No lure comes in the box: the monitor catches what walks into it.
Check it every week, and note where and when you found anything.
Change sticky cards when they fill with dust; a dusty card stops holding.

How many you need

A monitor watches one spot. Texas A&M counts two for each sofa and chair when the goal is to watch them.

Count the cups and monitors for your home.

Under-the-leg detectors in a pack of four

Four detectors come in the pack, one for each leg of a four-legged bed frame. Each one sits under a bed leg, so anything walking up from the floor toward your mattress reaches the detector first. Lift each corner of the bed in turn, set a detector beneath the leg and lower the frame back down.

A detector tells you something only when you look at it, so make a habit of inspecting all four on a set day each week. Beds with extra legs or a center support need a second pack to cover every point that touches the floor. Pair them with a zippered encasement if you want your mattress closed up as well.

SenSci BlackOut Under-the-Leg Detector is part of the Bed Bug Blocker catalog, on the traps and monitors shelf.

Side by side
Feature	SenSci BlackOut Under-the-Leg Detector	Bell Laboratories Trapper Insect Glue Boards	Nattaro Scout Monitoring Trap with Lure	JT Eaton Stick-Em Bed Bug Detector Traps
Packs	4	90	2	100
Each, from	$10.34	$0.22	$16.48	$0.56
Sticky surface	No	Yes	No	Yes
Lure in the box	No	No	Yes	Yes
Rating	4.0 (145)	4.5 (2,978)	4.5 (14)	4.2 (3)
Price	$41.35	$20.00	$32.95	$55.79
Buy

Where the SenSci BlackOut Under-the-Leg Detector goes and how often to look at it follows the EPA and Texas A&M's extension service: near the bed, where a cup cannot stand, with a look every week.

This is general information about keeping bed bugs out of a bed, not pest control or medical advice. A licensed pest professional, your doctor and the maker's own instructions come first.

What the public sources say

Texas A&M AgriLife Extension, "What is a bed bug interceptor?". Explains that bed bugs climb slippery vertical walls poorly, puts a cup under each bed post with the bed off the walls and no bedding on the floor, counts at least 12 cups for a two-bedroom apartment, and cleans them at least once a month. Read October 30, 2026.
U.S. EPA, "Do-it-yourself Bed Bug Control". Says to set interceptors under each leg of infested furniture, move it a few inches off the walls with no linens touching the floor, check and clean the interceptors every week, keep inspecting at least every 7 days, and use covers that seal mattresses and box springs so bed bugs inside die. Read October 30, 2026.
University of Kentucky Entomology, ENTFACT-636 "Bed Bugs". Says bed bugs zipped inside an encasement eventually die, that an encasement does not stop a bug from climbing onto the bed, that a trap under each leg with the bed pulled off the wall makes the bed an island, and that a dryer at medium-to-high heat for 10 to 20 minutes kills all life stages. Read October 30, 2026.

Each of these sources is linked in our guide on interceptor cups.

Questions

What Bed Bug Blocker shoppers ask about the SenSci BlackOut Under-the-Leg Detector

How many come in a pack of the SenSci BlackOut Under-the-Leg Detector?

You can buy the SenSci BlackOut Under-the-Leg Detector in 4-packs. The 4-pack works out to $10.34 a trap at our latest update. Put the SenSci BlackOut Under-the-Leg Detector where a cup cannot stand: along the headboard, by a nightstand or beside a sofa.

How often should you check the SenSci BlackOut Under-the-Leg Detector?

Lift the SenSci BlackOut Under-the-Leg Detector once a week, the rhythm the EPA gives for interceptors, look it over under a flashlight, and set it back where it was.