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. Lightweight 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 country 2) Please make sure that you use this fish finder in water depth over 1meter 1. Sonar Sensor: Depth Range: 2 - 200ft / 0.6 - 60m Sonar Frequency: 125KHz Sonar Radiation Angle: 90 degree(wireless) 45 degree (wired) Wired sonar cable length: 3meters Bluetooth Distance: 30-50m Operational Temperature: -10°C- 60°C 2. Power Supply: Mainframe: 3.7V rechargeable lithium-ion battery (included) Charging Time: about 2 hours Endurance Time: about 5-10 hours How to Use 1. Download the App "Fish Helper" file to your mobile phone (FOR Android), then click to install, then a "Fish Helper" App icon on your mobile phone 2. Open the BT inside the "setting" of your phone. Click "Fish Helper" App and enter the main interface 3. Throw the sensor the water, the water switch will power on the sensor. Click "setting", pop 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 wil Design Smart Phone Fish Finder Sonar Underwater Visibility HD Finder Bluetooth Intelligent Fish Visual Fishing The design is simple and elegant, suitable for various usage scenarios. The solid and durable construction ensures worry-free and convenient daily use.