The appliance include four projectiles and four lines.The projectile is fired by a pistol. Main specification： Throwing distance（in calm weather）：≥230 m Line breaking strength： 2 kn Deflection：10 degrees from center line Period of acceptability： Projectile：3years Throwing pistol：9years Type：HTP-2 JHTP-3 Warning： Use for distress signal only. Don't direct outlet to person. Use before the expiry date.