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1st to introduce the (app)cessories in Europe (2009)

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where to buy:

S.R.P (single pack):26,00 €

S.R.P (double pack):49,90 €


intro video






Control battery operated devices from your smartphone or tablet


Easy Setup
Tethercell is extremely simple to install. First, remove a single AA-battery from whichever device you choose. Next, make sure that Tethercell already has a AAA battery installed within it, then replace the removed AA battery with Tethercell. No matter how many AA batteries are required to run the device, you only need one Tethercell. After the Tethercell is snug in the battery compartment, turn on the device, fire up the Tetherboard app after downloading it free from iTunes or Google Play and you're ready to connect from any iOS or Android device that is Bluetooth Smart compatible.


The Tethercell App (for iOS and Android)
You can think of The Tethercell App as your Tethercell control center. From the Tethercell App you can easily connect to and control all active Tethercells in range straight from this intuitive interface which will be freely downloadable for supported devices. Tethercells have been tested to communicate with an iPhone 4S up to 100 feet away in an open field.


We’re designing Tethercell so that you can connect to a number of Tethercells instantaneously (we've tested up to four at once with good performance). No configuration processes, connections to maintain within your home network or other required hardware components. Once you have the app on your smartphone or tablet you’re ready to go. And since Tethercell only requires your smartphone or tablet for connectivity, connecting to Tethercell on the go is just as easy as connecting at home.


Intelligent Design
We believe that a lot of everyday products are begging to be re-examined and re-designed. As design engineers, we initially approached this project as a packaging problem, not too dissimilar from how you'd approach the ground up design of a new rocket engine or launch vehicle. While it may not be rocket science, our team's 20 years of collective experience in that field certainly came in handy during the conceptual and protoytpe design phase of Tethercell.



  • Turn AA-battery-powered devices on and off remotely
  • Be alerted when battery power is low
  • Set device schedules & timers
  • Find Tethercell enabled devices with proximity function




  • Height: to be updated...
  • Width: to be updated...
  • Length: to be updated...


manufacturer information

single pack
  • Part Number: TETH001
  • UPC or EAN No.: 862396000015
  • G&C code: IT.000093


double pack
  • Part Number: TETH002
  • UPC or EAN No.: 862396000008
  • G&C code: IT.000094




system requirements

  • All Versions


  • All Versions





Bluetooth Low Energy, as the name suggests, is the lower energy version of Bluetooth, the popular wireless radio technology. Bluetooth Low Energy was the enabling technology that made Tethercell possible; Bluetooth Low Energy, more commonly referred to as Bluetooth Smart Ready, requires significantly less power for operation than other traditional radio options. This technology will benefit a number of industries as many hardware developers are actively seeking solutions to shrink devices into increasingly smaller form-factors and power those devices for longer periods of time from equally small power sources.
A good quality AAA battery has about 1/2 to 1/3 the capacity of a AA battery. As a result, the AAA battery will run down first, at which point the app will notify you that it's time to refresh the AAA cell. Tethercell will cut off the circuit if the AAA battery discharges to such an extent that it could otherwise reverse charge and present a hazard. After refreshing the AAA cell, the device will continue to operate and the remaining life in the AA cells can be used until they are drained. Approximately 1/2 of the capacity of the AAA cell is used for the Bluetooth connection for 1 year of quiescent connectivity, leaving the remaining juice for the device it is installed in. Of course, for high drain devices, you'll probably be changing or recharging the AAA cell well before the 1 year mark.
Yes! Tethercell performs best with rechargable cells because of their low internal resistance, especially in high drain devices. We have tested Tethercell with Sanyo Eneloop XX batteries with exceptional results. In one test, a AAA cell charged to 1350 mAH capacity; paired with rechargeable AA cells, Tethercell really shines, and the life deficit is easily overcome, gaining you unprecendented functionality. We recommend NiMH Low Self Discharge cells (like Eneloop) for maximum performance.
Yes! We have successfully cycled NiMH cells on a La Crosse BC-700 charger multiple times, even at the 700 mAH setting! Tethercell supports the typical Charge/Discharge-Test/and Charge-Refresh functions common to NiCad and NiMh style chargers.
Yes, we have been working on reducing the size of the circuitry to facilitate embedding it in a AAA battery as well as a 9V. The larger cells are less of a challenge since the electronics present less of a percentage of the available real-estate, and we have a better power budget to work with.
Trey, one of the co-founders, struggled with inconveniences associated with the many toys and battery powered devices that made their way into his life once he had kids. Tethercell was born out of a desire to disable nuisance toys, conveniently enable parental overide for cordless mice, keyboards and the like, turn on a baby monitor without entering his son's room, and finding the TV remotes that seemed to to wander off a little too often when his toddlers took a liking to them.
We are making every effort to manufacture the most critical components of Tethercell close to home to ease logistics. We received many offers from US based suppliers to help us achieve that goal.
No, after setting a timing routine from the Tethercell app, the information is wirelessly communicated to the embedded micro-controler within Tethercell. Even after a connection is terminated, the programmed timers will continue to function.
Yes and no. We have tested Tethercell in an aluminum bodied AA sized flashlight. Although the device will connect, it needs to be in very close proximity to the transmitter (ie. phone or tablet). Once pared, it unfortunately suffers from very limited range (~ a few feet) because the aluminum impedes the RF transmissions to the antenna on-board Tethercell.
Yes, Tethercell can switch up to 5A of current, which is sufficient for most motorized devices. For high drain devices of this sort, we highly recommend using rechargeable chemistry batteries (NiMH or NiCad) as they have low internal resistance and therefore will not cause a noticable drop in performance. They also are also more economical since the AAA cell does have reduced capacity.
No, Tethercell is only capable of monitoring and reporting the charge status of the AAA cell contained within it.