Two Source, 6.5", Amplified Drop Ceiling Speaker with Bluetooth on a 2X2 tile and backcan assembly delivers up to 40 watts power directly to the speaker. Each powered speaker (2X2AMP-BT2S61) can drive three additional speakers (2X2IC6NA). One line can drive up to 10 self-amplified speakers. Lower noise feature and protection from shorts and overheating. 15 Volt DC Level 5 power supply included and optional Volume Controls are available. Available also in models without bluetooth features.* Bluetooth and Wi-Fi transmit in different ways using differing protocols. When Wi-Fi operates in the 2.4 GHz band, Wi-Fi transmissions can interfere with Bluetooth transmissions, and Bluetooth transmissions can interfere with Wi-Fi transmissions. Because Bluetooth and Wi-Fi radios often operate in the same physical area and many times in the same device, interference between Bluetooth and Wi-Fi can impact the performance and reliability of both wireless interfaces.(Source: White Paper on Wi-Fi and Bluetooth Coexistence by Laird Technologies).