Hign-concerned Chemical:None; Power Source:DC 5V; Language:English; Detecting Range:0.6-30 Meter; Sonar Coverage:45; Origin:Mainland China; WIFI connection:Apple/Android phone; Built-in battery:500MAH; Working temperature:-10℃-50℃; Detection angle:45/14° (two angle detection); Sonar frequency:125Khz/330Khz (dual frequency detection); Depth range:from 0.8-60M; Wireless operating range:100M; Features 1:Erchang F68 WiFi Fish Finder; Features 2:Erchang Fish Finder; Features 3:Fish Finder; Features 4:Echo Detector; Features 5:Fishing;