as the page shows both power-on trigger and remote-control trigger information
The 17 high-brightness LED beads provide flashing visual warning for vehicles
IP65 protection for outdoor use
9 built-in alarm tones and 4 flashing light modes for trucks
0–130dB adjustable volume for different site needs
YASONG SLA-S001 130dB Portable Highway Maintenance Alarm Siren, 100W, 20Ah Battery, Red Blue Strobe Plug-in Alarm Sirens as the page shows bothThe YASONG SLA S001 portable highway maintenance alarm siren is designed for road work, highway maintenance, tunnel construction, emergency rescue sites and temporary outdoor safety warning areas. This model combines a 300W maximum power alarm system, 130dB adjustable sound, red and blue LED strobe warning lights and a built in rechargeable lithium battery. It supports portable movement with a handle and pull rod structure, making it suitable for