Medium – October 28, 2015 – Radios drain batteries. By definition, in fact, radios radiate energy into space. The more energy they use to transmit, the further their signal will travel. So device developers have traditionally faced a tradeoff between range and battery life. You can build a Bluetooth sensor that lasts for years on a battery, but it you’ll get only 30 feet of range. Or you can build a cellular sensor with fantastic range, but you’ll need to recharge it every week. Read More>>