IP44 WATERPROOF: design material it's waterproof and makes your alarm more on or by accident. TWO ALARM MODES:DOUBLE PRESS the SOS button or PULL the chain out of the device (Alarm is off when long press SOS button or insert chain in) - When you open the alarm(Either way),the LED dazzling flash lights accompanied by loud alarm sound - 125db PERSONAL ALARM: The emergency alarm can make a 130dB loud sound to draw attention to protect you from having an emergency.In addition,the sounds could last 50 minutes continuous ear-piercing alarm at full power. RECHARGEABLE PERSONAL ALARM:Include the charging cable you can charge it in anywhere when it runs out of power,it has a recirculating rechargeable battery make the product more efficient and convenient., Manufacturer: Jnchdghwa