Sony Cyber-shot DSC-RX100 IV - Manual (Page 193)

To use [Smart Remote Embedded] or [Send to Smartphone], etc., the application
PlayMemories Mobile should be installed on your smartphone.
Download and install the application PlayMemories Mobile from your smartphone’s
application store. If PlayMemories Mobile is already installed on your smartphone, be sure to
update it to the latest version.
For details on PlayMemories Mobile, refer to the support page (http://www.sony.net/pmm/).
[210] How to Use Using Wi-Fi functions Connecting this product and a Smartphone
Connecting an Android smartphone to this product
1. Launch PlayMemories Mobile on your smartphone.
2. Select the model name of this product (DIRECT-xxxx: xxxx).
3. Input the password that is displayed on this product.
The smartphone is connected to the product.