This is the remote speaker microphone for the later models of the Anytone D578 mobile radios. It will control the radio over a Bluetooth link or through a wired connection.
I had this one on order for almost 3 months. Due to chip shortages that's how long it took to get it. Now I have to update the firmware in the radio and load up a test code plug. Most of the settings are imported from the hand held D878 radio so that saved a HUGE amount of time building a code plug from scratch. These radios can be rather complex to program due to all the features they have.
The mobile radio I have is the latest version of the D578. All though its is shown as a dual band radio with a change of the mode number in the programming software, for the US market, it will operate on the Ham 1.25M band in analog and digital modes.