The Cerwin-Vega Mobile Stealth Bomber Class D Amp (B55, 5 Channels, 950 Watts) features a speaker-level input with auto turn-on for more compatibility and application purposes. The advanced rollback power and thermal protection circuit ensure that the amplifier continuously plays when driven under the most extreme conditions. The BTR port will work with optional Cerwin-Vega Mobile Bluetooth receivers to provide a seamless connexion for streaming music with any Bluetooth-enabled device. Cerwin-Vega Mobile B55 Stealth Bomber Class D Amp (B55, 5 Channels, 1,900 Watts): Class D IR chipset Ultracompact high-density aluminium alloy chassis DirectFET power MOSFET output Speaker-level input with auto turn-on Advanced rollback/thermal protection BTR port for optional upgrade to Bluetooth receiver Extended mounting feet for ease of installation Dim: 10cm W x 27cm D x 3.6cm H 1,900W max 950W RMS 80W RMS x 4 + 200W RMS x 1 at 4 ohms 150W RMS x 4 + 350w x 1 at 2 ohms