Yes, they can sometimes use overlapping bands. However Bluetooth tries to minimize that by using FHSS [0]. I've witnessed it first-hand with my last ultrabok (

Yes, they can sometimes use overlapping bands. However Bluetooth tries to minimize that by using FHSS [0]. I've witnessed it first-hand with my last ultrabok (lenovo yoga 13, 2013), which uses a cheap radio (WiFi + Bluetooth) that shares several components, including a narrow USB bus. End-result: I couldn't use a BL mouse because my WiFi would go dial-up slow [1]. Macbooks had that problem too, FWIW [2]. The ONLY solution? Using a 5 GHz Wifi. [0] https://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum https://en.wikipedia.org/wiki/Frequency-hopping_spread_spect... [1] https://forums.lenovo.com/t5/Lenovo-Edge-Yoga-Lavie-Z-Flex/Yoga-13-Bluetooth-mouse-problem/m-p/1113957#M5296 https://forums.lenovo.com/t5/Lenovo-Edge-Yoga-Lavie-Z-Flex/Y... [2] https://discussions.apple.com/thread/6601731 https://discussions.apple.com/thread/6601731