Comparison Roidmi 3S vs Roidmi 1S

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	Roidmi 3S	Roidmi 1S
	from $22.63 up to $24.53 Outdated Product	from $17.07 Outdated Product
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Main	2 USB ports for simultaneous charging of gadgets. Fast charging. Backlight.	Hands-free function. Two ports for charging gadgets. Nice coloured LED lighting.
Type	FM transmitter	FM transmitter
Frequency range	88.1 – 107.9 MHz	88.1 – 107.9 MHz
Features
Bluetooth
Interfaces
USB input		/2pcs — 2.1 A and 1 A/
General
Charging port	USB A
24V support
Added to E-Catalog	november 2017	may 2016

Charging port

The transmitter has a specialized USB port for charging smartphones, tablets and other external devices.

Note that you can also charge external devices from conventional USB connectors; however, specialized ports provide higher power output, which can significantly reduce charging time. It is also worth mentioning that the specific purpose of such a connector can be different: in some models it works only as a power source, in others it can also be used to connect USB drives. Many FM transmitters have two USB ports — regular and charging; this allows you to simultaneously charge an external gadget and listen to music from a USB flash drive. And in modern devices, the old USB A form factor is supplemented by a modern USB-C port.