Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz[4]) from fixed and mobile devices, and building personal area networks (PANs). Wikipedia
New version of Bluetooth technology delivers “connectionless” IoT, advancing beacon and location-based capabilities in home, enterprise and industrial Bluetooth® 5 quadruples range, doubles speed, increases data broadcasting capacity by 800%