Fish Finders Portable Depth, 100m Smart Underwater Wireless Fishfinder with Fishing Alarm Echo Sounder Sonar for Lake Sea Fishing

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Fish and Depth Alarm: Allow you to instantly capture the fish without watching the float for a long time
USB Charging Design: can be charging by computer or portable battery
Sensor Working rem: the sensor working rem is according water conductivity, When the sensor is thrown to water, once the two pins touching water, the sensor will begin working
When the sensor is dropped out from the water, you can dry the remained water from pin surface, the sensor will stop working automatically
You should store it in a dry, nonmetal place when not using, the dampness may cause the sensor to turn on itself automatically. The battery will be depleted fast