Brande new module from the company HOPERF Bluetooth 5.0 module HM-BT4501. Documentation for the module under the link: HM-BT4501.pdf
. The module has a compact size of 12.5 x 17 mm, has a built-in DC-DC converter that allows you to work in the range of 1.8-3.6 V supply voltage. Made on the BT4501 chip, which has a simple circuit for switching on and a minimum of external RF components — only the connection of an external antenna.