The LeEco Le 1s can connect with the Otium Wireless Sports Earbuds over Bluetooth. We observed that the connection between the two devices is seamless up to 10 meters. After that, the connection becomes very unstable with a lot of audio disruptions.
This 10 meters range is lower than what the iPhone 6 and iPhone 7 can achieve with headphones using Class 2 and Class 1 Bluetooth.