There is no limit on the number of inthesk you can connect to your inthesk account, however, Bluetooth has a limit on the number of active connections it can maintain at one time.

On both Android and iOS devices Bluetooth can generally only maintain an active connection to a maximum of 5 devices at a time. This varies from device to device, so some devices may be able to handle more.

Note that this limit includes all Bluetooth devices you connect to your phone. For example, if you use a Bluetooth headset, it will represent one connection and will only be able to actively connect to 4 inthesk at a time. Any new Bluetooth device you connect to your phone will restrict the number of inthesk you can keep connected to your phone.