... 2.It can be fixed on the bike 3.It is waterproof Functions characteristics1. with unique fashionable design,fine and exquisite techniques ... as full bright, half bright, and SOS help signal blinking3. with built-in SOS signal alarm sound mode and obtain strong ... (out Audio input), can be used as computer sounder, equipped with Hi-fi loudspeaker7. adopting latest Class D digital power AMP ...