Feature: 1. Using a mobile phone application, it can be synchronized to the device via Bluetooth, which can easily track real‑time information. 2. It is very suitable for kayaking, canoe fishing, ice fishing, suitable for salt water and fresh water, and effectively locate fish. 3. Fishing recognition technology is used in conjunction with smartphones and tablets to transmit detection data to the device in real time. 4. Multi‑functional, it can help you draw water beds, mark points, record water temperature and depth, and add bait, species and videos in the travel log. 5. Small appearance, portable and light weight, it can be easily carried to multiple situations for measurement. Specification: Item Type: Wireless Sonar Sensor Product Size: Approx. 7x7x5cm / 2.8x2.8x2.0in Material: ABS Color: Yellow Battery: 3.7V/500mA Rechargeable Lithium Ion Battery (Battery Included) Depth: 0.8-60M (2.5-200FT) Radio Frequency: 2.4GHz Bluetooth Distance: Approx.30m / 98.4ft Sonar Frequency: 125kHz Power Life: 10H Working Temperature: -10-60℃ Sonar Radiation Angle: 90 Degrees. Package List: 1 x Sonar Sensor1 x Data Line1 x Manual Note: 1. Due to the difference of light and screen, the color of the product may be slightly different from the picture.2. Due to manual measurement, please allow a difference of 1‑3cm.