(Limited Quantities)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 () 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).