General Features Signal to Noise Ratio: 90 dB RMS POWER Output 4O: 45W x 4 RMS POWER Output 2O: 45W x 4 RMS POWER Output Bridged: 90W x 2 Dimensions(WxHxD): 5-11/16" x 1-3/4" x 3-7/8" Singal Sensing Turn-on Conformal Coating *1 *1: Do not install the unit in a spot exposed to direct sunlight or excessive heat or humidity. Also avoid places with too much dust or the possibility of water splashing. Built-In Bluetooth With today's smartphones hosting a wide variety of listening choices such as stored music, internet radio, podcasts, etc., it is no wonder that customers want to use this as their primary listening source. Bluetooth offers the easiest and most popular connection, KAC-M1824BT is not only your standalone Bluetooth gateway but if used with an in-dash receiver, it will double the power of a typical CD receiver with it's built-in 45Watts x 4 of amplification. A water resistant controller can be used to adjust volume and change tracks. IPX5 Remote Control The KAC-M1824BT remote control is designed to be mounted in places that are exposed to the elements. To operate in these conditions the remote control has a IPX-5 certification. This water resistant certification is the grade at which a device continues to function when directly subjected to 12.5 L of water per minute from all directions using a 6.3 mm inside diameter nozzle at a distance of approximately 3m for at least 3 minutes. This level of water resistance makes it perfect for ATV, Motorcycles and boats. Key Features CEA-2006 Compliant Power Output 45 watts RMS x4 @ 4 ohms Max Power Output  400w Class D 2 Ohms Load Capability Speaker Level Input Signal Sensing Turn-on Power MOS-FET Switching Power Supply Extruded Aluminum Heat Sink Design Line Output Terminals for Extension Bluetooth