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Comparison Roidmi 3S vs Roidmi 1S

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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.
TypeFM transmitterFM transmitter
Frequency range88.1 – 107.9 MHz88.1 – 107.9 MHz
Features
Bluetooth
Interfaces
USB input
 /2pcs — 2.1 A and 1 A/
General
Charging portUSB A
24V support
Added to E-Catalognovember 2017may 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.
Roidmi 3S often compared
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