Comparison Roidmi 3S vs Roidmi 2S

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	Roidmi 3S	Roidmi 2S
	from $22.63 up to $24.53 Outdated Product	from $14.83 Outdated Product
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Main	2 USB ports for simultaneous charging of gadgets. Fast charging. Backlight. No microphone.
Type	FM transmitter	FM transmitter
Frequency range	88.1 – 107.9 MHz	88.1 – 107.9 MHz
Features
Bluetooth
Hands free
Interfaces
USB input
General
Charging port	USB A	USB A
24V support
Added to E-Catalog	november 2017	october 2016

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Hands free

The presence of a hands-free function in the FM transmitter.

The speakerphone implies the presence of Bluetooth (see the relevant paragraph) and allows you to conduct conversations by broadcasting the voice of the interlocutor through the car's speaker system. This is the best option for talking on the phone while driving — the phone does not need to be held in your hand, and the audibility is better than from the device's own speaker.

At the same time, it is worth noting that the presence of Bluetooth in the FM transmitter does not mean the presence of this function, it requires the presence of a microphone. However, there are also transmitters without a microphone. In one case, in order not to make the conversation public when there are other people in the salon; in the second case, for models without Bluetooth at all.