Ibobber pulse takes the classic bobber and adds the advantage of our unique vibrating fish siren. Named after the classic seafarers legend, ibobber pulse with fish siren gives any angler an added advantage. You can use ibobber as a sonar fish finder, a depth finder, a bobber, and a fish attractor! no need to buy a separate fish attractor unit anymore. Connects to a free app for most iOS or Android devices using Bluetooth 4.0 and higher. One year manufacturer's warranty and top notch customer service for any issues you might have at 844-ibobber or infoatreelsonar.Com.