ULTIMATE SPEED® Ultrasonic marten repellent with flashing light SMX-MS31-01

Technical overview
The ULTIMATE SPEED® Ultrasonic marten repellent with flashing light SMX-MS31-01 is intended to discourage martens, rats and mice from engine bays, garages, carports, lofts and cellars. It combines variable-frequency ultrasound, two white flashing lights and a vibration sensor, with three alternative power sources.

Key features
▸ Variable ultrasonic range of 18–36 kHz with approximately 110 dB sound pressure
▸ Two white flashing lights and automatic operating cycles
▸ Vibration sensor that places the unit in standby while a vehicle is moving
▸ Operation from 4 AA batteries, a 12 V vehicle battery or a USB power adaptor

How it works and what it is for
Once switched on, the unit emits ultrasound, short cracking sounds and white flashes for about 10 seconds, followed by a pause of approximately 100 seconds. Movement or vibration triggers standby, with the next cycle beginning around 120 seconds after the last detection. Positioning must allow the ultrasound and light to spread without obstruction.

Main technical specifications
▸ Model: SMX-MS31-01; IAN 495842_2504
▸ Rated voltage: 5–12 V; current draw: 14 ± 2 mA
▸ Ultrasonic frequency: 18–36 kHz; sound pressure: approximately 110 dB
▸ Battery operation: 4 AA LR6 batteries rated at 1.5 V
▸ Vehicle-battery cable with 500 mA, 250 V fast-acting fuse
▸ Operating temperature: -25 °C to +65 °C
▸ Dimensions: approximately 13 × 7.5 × 3.4 cm; weight: approximately 97 g
▸ Installation only in a location protected from weather and water spray

Included accessories / compatibility
The set contains the repellent, 4 AA batteries, 4 cable ties, a USB-A cable, a fused 12 V vehicle-battery cable and instructions. A USB mains adaptor and mounting screws are not included. Vehicle connection is limited to conventional 12 V batteries in petrol or diesel cars and must not be made to an electric vehicle’s electrical system.

Who it is recommended for
This device suits home users who want to protect an engine bay or a covered space where martens and rodents are present. It can also be positioned in a garage, carport, cellar or loft, provided that the unit is protected from water, dirt and excessive heat.

Pros and cons
Pros
▸ Three power options for vehicle and building use
▸ Variable ultrasound combined with two flashing lights
▸ Vibration sensor suited to vehicle installation
▸ Cables, batteries and fastening ties included
Cons
▸ The housing must remain protected from water spray and weather
▸ Vehicle connection is unsuitable for electric vehicles or systems other than 12 V

Battery / consumables advice
Remove the AA batteries when using USB or vehicle-battery power and before long storage. Always replace all four cells together with matching AA LR6 batteries. If vehicle power fails, check the 5 × 20 mm F500MAL250V fuse in the supplied cable before further troubleshooting.

Objective final opinion
The SMX-MS31-01 offers flexible installation through variable ultrasound, flashing lights and three power options. Its vibration sensor is useful in a car, but correct placement and a clear path for the speaker and lights are important operating conditions.

FAQ
How does the SMX-MS31-01 repellent operate?
It alternates roughly 10 seconds of ultrasound and flashing light with a pause of about 100 seconds. The cycle repeats automatically while active.
Can it connect directly to a vehicle battery?
Yes, using the supplied fused cable, but only with a conventional 12 V battery in a petrol or diesel vehicle.
Are the batteries included?
Yes. Four 1.5 V AA LR6 batteries are supplied together with the USB and vehicle-battery cables.
Can the unit be exposed to rain?
No. It must be installed where it is protected from weather, water spray, dirt and excessive heat.