Bluetooth control distance: the visual distance is about 10 meters (ideal open distance is greater than 20 meters, bluetooth signal can be easily blocked without penetrating the wall, external 2.4g antenna can effectively improve the distanc e). Working principle: After the bluetooth module is connected through the mobile phone APP, high level output is controlled by the module port in the form of buttons. Each button can set the working mode independently, such as self-lock, click, timing and delay, so as to achieve wireless remote control of the mobile pl hone. The YS-BL2K Bluetooth module is a cutting-edge solution for those seeking to integrate wireless control into their electronic devices. With its 2-way Bluetooth 4.0 connectivity, this module enables you to remotely control your devices from a distance, providing unparalleled convenience and flexibility. Whether you're turning on lights, managing appliances, or controlling other electronic devices, the YS-BL2K ensures a reliable and efficient connection, making it a valuable addition to any smart home setup or DIY project. Color: White Material: plastic Specification: 12V Package Contents: 1*wireless control switch 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.