TINYSINE TSA1110, Smartphone Bluetooth Remote Audio Volume C

If you want to remotely control your old CD audio system. This is a good choice! Just lie in the bed, open the smartphone APP, and you will be able to control the audio volume. TSA1110 is a smartphone bluetooth audio volume controller. It's integrated a digital potentiometer and a powerful Bluetooth, and its control distance is up to 30m (outdoor).  After it is connected with your audio amplifier, you can use an Android or iPhone APP to control the audio volume on the smartphone. It's easy to use. There are 3 ports for Audio in, Audio out and DC5V. Connect this TSA1110 with your smartphone via Bluetooth first, then rotate the virtual knob. The internal potentiometer value will change accordingly as you rotate the knob and the audio volume will change accordingly as well. A real volume knob is also designed for you to adjust the audio volume by simply rotating it.