Automatic early warning device of environmental risks at water bodies may be regard as biomonitoring utility by remote monitoring of Bivalve conditions. This device consists of animals, infra-red optic sensors, cables, server, computer, mobile phone. Buoy consists of accumulator, data manipulator, combined gear and retrodirective antenna. Due to such design we may guarantee the free-running work of device, reduction of costs for service, and also use our device in situ. Approbation of our device was made on freshwater and saltwater Bivalve. The high stability of heart rate and availability of device as laboratory so in field conditions.