BruceE3

Thanks for your comment, so hopefully I can provide some answers to your questions. First of all, you do not need to use a slider switch, as any switch will do. The switch is only there so you may turn the device on and off. The battery is lithium, and as such, is unpredictable in it's life, though you can ensure that it will last about a few days with regular days. You are able to recharge the battery, by removing it from the circuit and charging it separately. When connecting the bone conduction speaker to your phone, you will be using an AUX input, meaning your standard headphone cord. The amplifier board ensures that the other parts of the circuit function on par with the speaker. I hope I was able to provide some answers to your questions.