Sonar fishing identifying technology:works in conjunction with smart phones and tablets, detection data is transmitted to the phone in real time, allows you to map water beds, mark spots, log water temps and depth, add lures, species and video in the trip log.Free App on for IOS or for Android: "Fish Helper" syncs via Bluetooth smart to the device. Bluetooth connection secures the distance between the device and its user up to 164 feet / 50 meters.Fish alarm, noise filter, 90-degree sensitivity:for the user to select, sonar frequency is 125KHz, depth up to 200ft / 60m, with rechargeable 3.7V lithium-ion battery, the using time is up to 10-20 hours. and useful: the diminutive device is suitable for every standard rods and lines.Wide application:ideal for kayak, canoe fishing, ice fishing, works both in saltwater and freshwater, effective at locating fish and structures on ponds, lakes, streams and rivers.Top Important:1) Please make sure that your phone can download our app and operate it in your country2) Please make sure that you use this fish finder in water depth over 1meter1. Sonar Sensor:Depth Range: 2 - 200ft / 0.6 - 60mSonar Frequency: 125KHzSonar Radiation Angle: 90 degree(wireless) 45 degree (wired)Wired sonar cable length: 3metersBluetooth Distance: 30-50mOperational Temperature: -10C- 60C2. Power Supply:Mainframe: 3.7V rechargeable lithium-ion battery (included)Charging Time: about 2 hoursEndurance Time: about 5-10 hoursHow to Use1. Download the App "Fish Helper" file to your mobile phone (FOR Android), then click to install, then a "Fish Helper" App on your mobile phone2. Open the BT inside the "setting" of your phone. Click "Fish Helper" App and enter the main interface3. Throw the sensor the water, the water switch power on the sensor. Click "setting", up setting interface. After pairing, the product starts to work (the white LED is blinking)4. After the phone and the sensor connection, the device automatically enter the last time mode. If you need to detect, please confirm whether it is working mode. Otherwise, the device not detect properlyColour:As ShownMaterial:ABSPackage Contents:1 x Fish FinderOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.