What is the difference between the Bluetooth stereo module aptX/aptX LL/aptX HD?

In the field of Internet of Things, no single technology can completely dominate this market. Many technologies have their necessity due to different market demand points, complement each other and cooperate. However, the importance of Bluetooth technology can still be seen through our latest survey data. At present, among all IoT technologies, the adoption rate of Bluetooth module technology ranks first. The report shows that 38% of all IoT devices use Bluetooth technology. This adoption rate far exceeds Wi-Fi, RFID, cellular networks and even other technologies such as wired transmission. 

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There are currently two different Bluetooth radio options: Bluetooth Classic and Bluetooth Low Energy (Bluetooth LE). Classic Bluetooth (or BR/EDR), the original Bluetooth radio, is still widely used in streaming applications, especially audio streaming. Bluetooth Low Energy is mainly used for low-bandwidth applications where data is frequently transmitted between devices. Bluetooth Low Energy is known for its extremely low power consumption and its popularity in smart phones, tablets and personal computers.

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When the size of various devices gradually shrinks, the low power consumption characteristics of Bluetooth make it possible to maintain high-efficiency operation of devices and sensors for months or even years with only a very small battery, and maintain high stability with other devices.

Currently, Feasycom has a mini size Bluetooth 5.1 Serial Port module FSC-BT691, this module has on-board antenna, the size is only 10mm x 11.9mm x 2mm. At the same time, it is also an ultra-low power consumption module, using the Dialog DA14531 chip, the power consumption in sleep mode is only 1.6uA.