Portable Wired Fish Finder with floating sonar senor Depth readings from 2.0 to 240ft in 1/10th precision. Operational Temperature: -4F to 158F(-20 to 50) suitable for ice fishing.FF718 Portable Wired Fish Finder with floating sonar senor Depth readings from 2.0 to 240ft in 1/10th precision Small round transducer with 7m cable,45-degree beam angle,Removable float 200KHz Sonar Frequency Operational Temperature: -4F to 158F(-20-70) suitable for ice fishing