Voice communication in the LPD band was introduced to reduce the burden on the eight (now sixteen)[2] PMR446 channels over shorter ranges (less than 1 km).
[3] LPD is also used in vehicle key-less entry device, garage or gate openers and some outdoor home weather station products.
In the UK, LPD433 equipment that meets the respective Ofcom Interface Requirement can be used for model control, analogue/digitised voice and remote keyless entry systems.
[5] Ofcom, together with the RSGB Emerging Technology Co-ordination Committee have produced guidelines to help mitigate the side effects of interference to an extent.
[8][9] According to a recently published (June 2021) resolution of the Spanish government,[10] where it defines 'interface IR-266', non-specific mobile short-range devices may be used without authorization for voice applications with 'advanced mitigation techniques' (such as listening before talking[11]) from 434.040 to 434.790 MHz, with channels narrower than 25 kHz and with a maximum 'apparent radiated power' of 10 mW.