Though the technology is great, it also requires a lot of battery power. For this reason, hearing aid manufacturers often make use of devices that connect to the Bluetooth hearing aids to provide extra power. This can be a bit cumbersome because it requires the consumer to have to carry an additional device with them, even if it is something that easily fits in a pocket.
Another downside with Bluetooth used in hearing aids is that it is the same frequency used with cordless phones 2.4 GHz. This means that there is only about twenty five to thirty feet of signal strength.