Hi. I am trying to develop a Bluetooth device. This Bluetooth device will connect with a corresponding app on an Android/ ios phone. The device will have a fingerprint sensor and a carbon monoxide sensor built in to it. There shall also be a power circuit. The function of the power circuit will be 1. Charge a lithium battery from a micro usb plug. 2. Derive power from the lithium battery to run voltage across 2 terminals when the fire switch is pushed. The fire switch can be activated only when the biometric registration is verified and the carbon monoxide level is below a certain amount determined by the accompanying app.