SM716 Transmitter
Replacement or spare beltpack transmitter for the Fitness Audio U-Series wireless mic system. Built specifically for sweat: a sealed one-piece case with no hinges, no flaps, and no external antenna wire to snap off, a corrosion-inhibiting lacquer coating on the circuit board, and a single on/off switch. 16 switchable UHF channels, 9V battery powered, pairs with the SDR-5616 receiver.
Transmitter only. Headset mic and receiver sold separately. Must match your receiver's frequency group — see below for how to check yours.
Shipping box: 8.7 x 4.3 x 2.0 in, 0.33 lb
SKU SM-716-SU520
SM716 · The U-Series beltpack
A beltpack with nothing to snap off.
One-piece sealed case, no hinges, no flaps and no external antenna wire. A single on/off switch, 16 UHF channels and a 9V battery. It's the transmitter U-Series systems have shipped with for 15 years.
Why it survives
No hinges, no flaps, no gaps for sweat.
The case is one sealed piece. The circuit board inside is lacquered against corrosion. The headset locks into a T4 socket on top and releases with a push button, never a twist. Tone-coded transmission means no pop when you switch on or off, so there's no mute switch to knock.
Swap the 9V, clean the pins and apply eGloop monthly, and an SM716 keeps going.
Inside the case
What you'll touch
- SwitchSingle on/off, no mute to knock1
- BatteryStandard 9V, under the cover9V
- ChannelsSelector under the cover16
- HeadsetLocking T4, push-button releaseT4
Everything else stays sealed.
For the instructor
Push the headset connector straight in. To unplug, press the button and pull. Never twist.
Spare 9V in the bag, and you're never off air. The locking socket holds through floor work and burpees.
For the gym
Replacement or spare for any U-Series system. Match the frequency group on your SDR-5616 label, then give each room its own channel. Up to eight can run at once across a facility.
Transmitter only. Receiver and headset sold separately. 1-year warranty.
Want rechargeable instead? The UTX16 pairs with the same receiver.
About the SM716
Tech specs
The SM716 is the beltpack transmitter for the Fitness Audio U-Series, the wireless platform fitness facilities have relied on for over 15 years. Its one-piece case has no hinges, flaps, or external antenna wire, and the circuit board inside is coated with a corrosion-inhibiting lacquer, so sweat has nowhere to get in and nothing to attack. A locking TA4F connector holds the headset secure through floor work, and 16 switchable UHF channels let one spare pack cover every room in a multi-room facility. Runs on a standard 9V battery with a single on/off switch.
Sealed one-piece, no hinges, flaps or external antenna; lacquer-coated circuit board
16 switchable UHF channels. Groups 520, 536, 540, 560 and 580 MHz, matched to the receiver
Locking 4-pin T4 mini-XLR, push-button release
Tone-coded, so no power on/off pop and no mute switch needed
Standard 9V, not included
8.7 x 4.3 x 2.0 in, 0.33 lb
1 year
Make It Last
Fitness Audio's official guidance for busy schedules: if your room runs blocks of back-to-back classes, keep at least two transmitters and alternate them so each pack dries out between uses. Wear the pack in a neoprene pouchbelt, which keeps a moisture barrier between the transmitter and your body.
FAQ
How do I know which SM716 frequency group to order?
Check the silver sticker on the bottom of your U-Series receiver, or the one next to the battery inside your current transmitter. Order the SM716 in that same group. Transmitters and receivers in different groups will not connect. If you can't find or read the sticker, contact us and we'll identify your group.
Will the SM716 work with my receiver?
It pairs with Fitness Audio U-Series receivers, including the SDR-5616, when both are in the same frequency group. It will not work with the DX6 digital range, the older D-Series, or other brands' receivers.
What's the difference between the SM716 and the MTU8 transmitter?
Both work with U-Series receivers. The SM716 is a beltpack worn at the waist or arm with a cable to the headset; the MTU8 is a mini transmitter that mounts directly on the headset frame with no beltpack at all. The SM716 uses a 9V battery; the MTU8 runs on a single AAA. Studios often run both on the same receivers.
How sweat-resistant is the SM716?
This transmitter exists because ordinary wireless packs die in fitness rooms. The case has no hinges, flaps, or external antenna wire for sweat to attack, the circuit board is coated in corrosion-inhibiting lacquer, and the connector and battery contacts ship pre-treated with eGloop electrical grease. For heavy schedules, Fitness Audio recommends rotating two packs so each dries between classes.
What battery does it use and how do I turn it on?
A standard 9V battery, and a single on/off switch — that's the whole interface. Tone-coded transmission means no pop over the speakers at power-on, so there's no mute button to fumble with.
Why does my headset click into this transmitter instead of screwing on?
The SM716 uses a locking TA4F mini-XLR: push in to connect, press the release button to disconnect. The single-action keyway keeps the mic connected even when the cable gets torqued sideways during floor exercises, which is where twist-on connectors fail.
Do I need a special headset mic for it?
You need an Aeromic, Cyclemic, or E-Mic terminated with the TA4F connector for Fitness Audio/Shure-type packs. If your headset has a different termination, it won't connect — check your connector or contact us before ordering.