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