Unfortunately, we don't have a way to cut power to the BT module. In the future, we will potentially have a unit that will not be BT equipped.
For what it's worth, two comments on the chip we are using:
- We are using a Silicon Labs BLE113 low-energy BT chip: http://www.silabs.com/products/wireless/bluetooth/bluetooth-low-energy-modules/ble113-bluetooth-smart-module
- In the sleep state, it consumes 0.0000015W, which is then all the available energy for emitting a signal; it is designed to work off a coin battery (although our unit does not). Also, the power drop off is by 1/r2, which hits an effective zero by about 30 feet. By comparison, a typical WiFi router is between 2-10W, where the bulk of the energy is going into signal transmission.