2.1 Bluetooth Marine Amplifier Receiver - Waterproof 4 Channel Wireless Bridgeable Audio Amp for Stereo Speaker with 1000 Watt Power Dual MOSFET Supply, GAIN Level and LED Indicator - Pyle PLMRA430BT 4 CHANNEL BRIDGEABLE AMPLIFIER: Pyles PLMRA430BT is engineered as a 4 Channel bridgeable marine amplifier that powers up your speaker and is universally compatible. It has a bridge mode selection switch and high or low electronic crossover network 2.1 BLUETOOTH CONNECTIVITY: Built with 2.1 Bluetooth connectivity that has a wireless range of 25+ feet. Compatible with all Bluetooth devices like iPhone, Android, iPad and tablets. It even has a smart auto connect that remembers device pairing info WATERPROOF & WEATHERPROOF: The audio amplifier is waterproof with its marine grade rating of IP-01. Its constructed with silver-plated stereo speaker output terminal connectors to combat weather corrosion with long term us SHORT PROTECTION: Built with a heavy duty Aluminum Alloy heatsink, thermal overload speaker short protection and LED light indicator. These are to protect the amp and your vehicle's electrical system from short circuit conditions POWERFUL 1000 WATT: This amplifier receiver is powerful with its 1000 WATT MAX and dual MOSFET power supply. Comes with dual adjustable input GAIN level controls between 4 to 8 Ohm speaker impedance