Product principle: The for mijia smart device is transmitted to the device through infrared. The device converts the infrared signal into radio frequency signal and sends it to the remote control Support 9 kinds of frequency automatic recognition:310/315/330/350/390/418/430/433/450 Supporting equipment: The gateway device that supports infrared is required. For example for Millet universal remote control, for small love universal remote control version speaker, for small love PLAY enhanced speaker, for small love PRO speaker, for Agara M 2 gateway, for small degree 1S speaker, for small degree Donkey Kong speaker Power input DC: 5V/1A Standby power: Less than 0.2W<br><br>Product size 6.6x2.3x1.4cm Colour:As Shown Material:Plastic<br><br>Package Contents: 1 * RF Switching Controller<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.