Flat Top 18650 Li-Ion Battery without Protection (3.7V) - BIS Certified Line Tracking The keys are connected into

The keys are connected into a matrix

Pulse Width: 500-2400 µs

when the emitted infrared light has not been reflected or the strength is not big enough

The batteries are unprotected and best work with out 16340 Battery Shield and 16340 Arduino Shield

Flat Top 18650 Li-Ion Battery without Protection (3.7V) - BIS Certified Line Tracking The keys are connected intoThese lithium ion batteries come in a variety of configurations and capacities. The battery with a protection circuit provides over voltage, under voltage, and over current protection. Yet, it is slim and easy to fit into many project cases with a battery size of 18mm*65mm These batteries do not come with protection circuitry. It is very important that you only use a LiIon LiPoly constant voltage constant current charger to recharge them and at a rate