Hello Everyone, In this post I will tell you how to change the ringtone on the C313S device. First of all, we will make the adjustments from the device menu. Press the "More" button on the device screen. Then we press the "Setting" button. Then we click on the "Advance" button. Here it will ask you for a password. The default password is "123456". When you press "Doorbell" on the screen that opens, you can change the ringtone as you wish from the menu that opens.










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