1、Adopts quality plastic, constructed with fine machining and waterproof processing, resistant to corrosion of marine water, adaptable to harsh temperature from -10 to 60 centigrade, durable for long time use 2、Built-in sonar offers 90 degree detect angle, 30m control distance and 36m detect depth, can make you find where fish it is in water or under the ice to save your time and improve fishing efficacy 3、125HKz frequency ensures stable signal with anti-interference effect and quick data return. Smart tech can automatically distinguish the density of aquatic plants 4、Easy to use, just need to put the finder on fishing line, and connect finder to smartphone via bluetooth link, you can see the data on smartphone via APP 5、Portable and lightweight, useful tool for fishing lovers. 1000mAh large capacity battrey can offer you 10 hours of long working Features: Adopts quality plastic, constructed with fine machining and waterproof processing, resistant to corrosion of marine water, adaptable to harsh temperature from -10 to 60 centigrade, durable for long time use. Built-in sonar offers 90 degree detect angle, 30m control distance and 36m detect depth, can make you find where fish it is in water or under the ice to save your time and improve fishing efficacy. 125HKz frequency ensures stable signal with anti-interference effect and quick data return. Smart tech can automatically distinguish the density of aquatic plants. Easy to use, just need to put the finder on fishing line, and connect finder to smartphone via bluetooth link, you can see the data on smartphone via APP. Portable and lightweight, useful tool for fishing lovers. 1000mAh large capacity battery can offer you 10 hours of long working. Specification: Material: ABS Color: Shown as picture Radio Frequency: 2.4GHZ Sonar Frequency: 125kHZ Working  Time: 10hours Detect Angle: Approx. 90 degree Control Distance: Approx. 30m / 98ft Detect Depth: Approx. 0.6-36m / 2-118ft Working Temperature: -10℃-60℃ Battery: 1000mAh Cable Length: Approx. 99cm / 39in Size: Approx. 6.8 x 5cm / 2.7 x 2in Weight: Approx. 223g APP: Fish Helper Package List: 1 x Fish Sensor 1 x USB Cable 1 x Manual 1 x Disc