Is the volume of this burglar alarm effective in deterring burglars? Yes! The alarm adopts 3 levels of adjustable volume, maximum 110dB high-frequency siren, 7 levels of sensitivity adjustment can accurately identify abnormal vibration, instantly triggering the ear-splitting alarm to scare off thieves How long is the battery life? Does it need to be charged frequently? Alarm host: built-in 700mAh lithium battery, USB-C charging for 3 hours, active alarm mode available for 1-3 months, standby up to 6 months; Remote control: standard 12V alkaline battery, daily operation 5 times can last 1-2 years. How many remotes can this bike alarm be paired with? This bike alarm can pair up to 8 remote and lots of alarms. better meet the needs of the family