SMM-U1 Microphone for SM4BAT and SM3BAT without cable

£227.00 Ex. VAT
In stock

Highly sensitive, low noise ultrasonic microphone.


If you have a Song Meter SM4BAT or SM3BAT then the SMM-U1 is a must-have accessory. This weatherproof ultrasonic microphone has a Knowles FG element which provides a flatter frequency response, high sensitivity. Low noise and omnidirectional, this microphone is designed to pick up more bats.

The SMM-U1 is ideal for your legacy projects that require year-to-year microphone performance continuity, and unattended monitoring where the precise direction of bat activity is not known in advance.

Key features:

  • Knowles FG element
  • Metal housing to assist with grounding
  • Low noise
  • Omnidirectional


To add an extension cable please click here.

Technical Specifications:

Ultrasound recording capability (kHz): up to 190 kHz
Cable requirement: up to 100m in length
Waterproofing: hydrophobic membrane*
Enclosure: Weatherproof stainless steel
Directionality: Omnidirectional
Element: Knowles FG
Output: Differential
Built-in high pass filter: 4-pole at 8 kHz

*In gusty windblown rain, water may pass the hydrophobic membrane. A windscreen should be installed so as to protect the internal ultrasonic
transducer from water damage.


Q. What is the best way to position the microphone to protect it from water?
A. We recommend positioning the microphone so that it points parallel to the ground, or even slightly downward.

Q. How can I use the SMM-U1 for applications requiring directionality?
A. The microphone can be adapted for directional sensitivity with the available SM3 Horn Attachment which turns the omnidirectional ultrasonic microphone
into a highly directional microphone while preserving call quality. It is worth noting that the attachment remains weatherproof at angles up to 45-degrees.

Q. How do I install a microphone windshield?
A. Windscreens should be installed on SMM-U1 microphones for long-term
deployments in all areas susceptible to heavy wind-driven rain. Secure the windscreens for the SMM-U1 microphone with the included C-clip. Make sure there is an air gap between the windscreen and the microphone as shown below. (Do not pull the windscreen down tightly). For the SMX-Horn directional attachment, secure the large windscreen with the included zip-tie as shown below. The exact positioning is not important.

Q. How will the windscreen impact recordings?
A. The windscreens will attenuate ultrasound by only a few dB when dry. However, they will block most ultrasound when soaked with water, until they dry. Drying time can vary significantly based on temperature, humidity, and wind.

Q. What should I do to the high pass filter if I expect bats to vocalise below 16 kHz?
A. For bats, the SMM-U1 microphone has a built-in 4-pole filter at 8 kHz - set this HPF to 1 kHz and the 8 kHz filter in the microphone will reduce acoustic sound below 8 kHz. For those who do not expect bats below 16 kHz, it is best to use set this filter to 16 kHz and filter out more acoustic noises that might cause non-bat recordings to occur. At 16 kHz setting the filter is a four-pole filter.

Q. How do I measure microphone sensitivity
A. Firstly you need an Ultrasonic Calibrator, which helps you test both the microphone and the full recorder system. To test a microphone, the calibrator generates a calibrated 40 kHz tone. There will be instructions included with this device.

We now offer FREE UK SHIPPING for online orders over £75 to the UK mainland (under 20kg), including service & repair items. For information on qualifying requirements for free shipping, please see our delivery page.

We aim for next working day delivery on all UK mainland orders received before 2.30pm. Where products need to be made to order or are not a regular stock item, or during busy times of year, despatch times may be longer.

If your order is urgent please call us on 01451 833 181. There is usually an additional charge for timed delivery.

We will always use a reputable courier company and require a signature on delivery. Smaller items are usually shipped using Royal Mail or DPD, and larger items are sent using TNT or Tuffnells. Palletised deliveries are with Pallex.

We will email you shipping confirmation after your order has been despatched. Where available, you will also receive tracking notification by email or text. If you need to track your parcel urgently then please contact us.

We can deliver to anywhere in the world, but you may need to contact us for a quote.

If your order doesn’t qualify for free shipping then UK mainland delivery starts at £7.92 ex VAT, while Highlands and Islands delivery starts at £12.50. You can calculate shipping costs using the basket.

For full delivery information please click here.

Important Information About Backorders

At Wildcare there are times when items are only available on a backorder basis, either due to high demand or if the item is a special order item. We refer to these as ‘backorder items.

Backorder items are clearly listed on our website as ‘Order To Reserve Stock (Backorder)’. Items that are in stock and ready to be shipped immediately are listed as ‘In Stock’.

When you place an order for a back order item or an order that includes back order items, a member of our team will be in contact within 48 hours of your order to confirm the lead time for delivery. For any queries before then, please call us on: 01451 833 181

Avoiding Disappointment

We cannot guarantee that a backordered item will come back into stock or be delivered for a specific date, however we will always do our best to keep you informed and updated.

If your back order is urgent or required within a specific time frame we suggest to call us on 01451 833 181 so we can keep your requirements in mind throughout the waiting period.


If you receive damaged items or the wrong goods, please let us know straight away so that we can arrange for them to be returned to us and replaced as quickly as possible.

You will need to obtain a Returns Number  - please call us on 01451 833 181 or email [email protected]

Please return goods, WITH THE RETURNS NUMBER MARKED ON THE PARCEL to: Wildcare, Eastgate House, Moreton Road, Longborough, GL56 0QJ

We may ask for a photograph any damaged items before we agree to replace them.

Please click here to view our full returns policy.