Mengshen Wireless Door Window Security Alarm with Remote Control - 1 Alarm 1 Remote Control M64 1) It has compact, small and innovative design, giving you all-round security, 2) It can be used for at least 1 year, avoiding the trouble to change battery frequently, 3) The loud alarm can deter thieves effectively, 4) Remote control, more convenience. Easy to operate and install, 5) With 105 dB alarm, low battery indication.