3M 7100204436 is a hard hat attached protective communication product designed to provide hearing protection with an attenuation rating of 25 dB. It offers wired and wireless connection options through Bluetooth, and has a battery life of approximately 18 hours with a rechargeable lithium-ion battery. The product is CSA Class A certified and compatible with Kenwood and Motorola radio brands. It features a hard hat mount suspension method with a microphone for two-way communication. It also includes external audio input and level dependent function for ambient listening. Weighing 472 g (16.6 oz), this 3M product is ideal for communication in noisy environments.