... 3V CR2032 Button Cell Battery for Sensor,manual This Wireless Fish Finder is especially designed for fishermen and fishing enthusiasts, to search ... transducer and reception of the object is measured. Then the fish finder uses the received signal to interpret the location, size ... 120 g (batteries not included) Package included:* 1 x Wireless Fish Finder* 1 x Wireless Remote Sonar Sensor* 1 x Neck Strap ...