nergy) The low-power transmission technology introduced in Bluetooth 4. Using watch batteries, Bluetooth LE devices can operate for months or years before requiring replacement. Operating in the 2.4GHz frequency band, Bluetooth LE supports peer-to-peer and star topologies. See ANT
Smart = Low Power; Smart Ready = All Bluetooth
Products with the Bluetooth "Smart" branding use only low-power Bluetooth LE transmission, whereas Bluetooth "Smart Ready" devices support both classic Bluetooth and Bluetooth LE.
Wibree -> ULP -> BLE
Originally the Wibree technology from Nokia, Wibree was renamed Bluetooth Ultra Low Power (ULP) in 2007 and Bluetooth LE (BLE) in 2009. See Bluetooth versions