The "LE" stands for "low energy" and it's one of the primary advantages of Bluetooth Low Energy (BLE) over other Bluetooth.
BLE leverages a trade-off of range vs connection speed. So the fact that its slower connection speed allows for more range means you couldn't play music across that greater span, but you can effectively transfer small payloads like Meter data. Also, this slower connection speed requirement means the Meter can allocate additional power to tasks more central to the purpose of the device. For example, it makes it possible for the Meter to have a higher sample rate.
Most (battery-powered) SwitchBot products are equipped with BLE capability, so you can use them directly with your mobile phones. Additionally, we also apply our own cutting edge power-saving technology, so you can always enjoy a better battery life experience.