Feature: 1. Professional reliability RF performance and transmits full AIS messages. 2. Smart GPS antenna module allows an excellent GPS signal receiving. 3. Built-in rechargeable battery with more than 240 hours. 4. High-level waterproofing protection up to IPX7. 5. Self developed AIS fishing net tracking buoy, allows you to get an accurate location at night, in rain and fog. 6. Also it can avoid collision accidents by other boats. Specification: Condition: 100% Brand New Item Type: Tracking Buoy Color: As Pictures Shown Standards: EC62287-1: 2006-03 IEC60945: 2002 ITU-R M.1371-2 Position Update: Every 3 minutes Working Frequency: 161.975MHz / 162.025MHz Output Power: 34.8dBm1.5dBm Channel Bandwidth: 25 KHz Modulation Mode: GMSK Bit Rate: 9600b/s50ppm(GMSK) Size: Approx. 330 x 90mm / 13 x 3.5in Weight: 0.5 KGS Battery: 8.4V, 4000mAh, rechargeable (Built-in) Working Time: More than 240 hours Antenna: Built-in VHF/GPS antenna GPS Module: IEC61108-1 standard Working Environment: -20? 55? Waterproofing: IPX7 Package List: 1 x HAB-120 Tracking Buoy 1 x EU Plug Adapter 1 x Charging Cable