1. G Keni Bike Cycling Taillights, Intelligent Anti-Theft Bicycle Alarm, Warning Electric Wireless Bell, Waterproof and rechargeable with USB Cable Mountain Accessories (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
3 IN 1 COMBINATION: This is a good combination of bright taillight + intelligent remote alarm + electric bell to keep you safe and your bike from stolen. All operations by remote controller, really the best bracket parts of a bicycle saddle bracket, adding hidden design like a cicada and easy installation, small and beautiful light, light weight and waterproof, so you won't worry if your bike are outdoor.AWESOME ANTI-THEFT ALARM: The highest decibel up to 120 decibels, any movement of the bike and it will have warning beeps. If the bike continues to move, it will emit piercing alarm sound sharp enough to frighten and deter thieves

2. Anpress® TE-168 Rainproof Anti-theft Remote Control Bike Bicycle ABC Alarm with High sensitive protection probe and 110 DB High export sound (Click Link to Check Price on Amazon)
Editor's Rating : 9.4 out of 10
3 Sensitivity levels allow you to determine how much movement is needed to trigger the alarm.Waterproof, attach permanently to your bike without worrying about having to remove it in bad weather( Note: Can't be immersed in water)

3. XIAOKOA Bike Tail Light, USB Rechargeable Remote Alarm Taillights with 10 LED 120 lumens & 3 Light Mode Options & 100 meter Remote Control 120 decibel bells waterproof and Concealed design. (A6 Plus) (Click Link to Check Price on Amazon)
Editor's Rating : 9.6 out of 10
The new avant-garde design: concealed design to minimize the mud adhesion rate, 5 star waterproof protection, equipped with a multi-function wireless remote control (limited distance of 100 meters)Driving bell / COB light source: 120 db bell sound crisp and bright with COB bright light source to simultaneously alert the front and rear, designed to protect you and others safe.

4. KEWAYO Bicycle Horn and Alarm Cycling Bike Alert Bells Ring Loud Electric Siren (Click Link to Check Price on Amazon)
Editor's Rating : 9.7 out of 10
Electron Loud Alarm: Good performance of 90 dB sound,loud enough to attract attention and warn the walkers. Sound likes "chirp" "chirp", more like a siren.Anti-theft Alert: When the horn is in the surveillance state, if the bicycle is vibrated, it will alarm with loud sound for 15 seconds. It is still in the surveillance state after first alarm. If the bicycle shakes again, a further 15 seconds alarms will follows.

5. Bicycle Wireless Taillight OUTERDO 3 in 1 Cycling Alarm Bike Light Mountain Bike Bell Tail Light with Wireless Remote USB Charging Waterproof LED Bike tail lamp (Click Link to Check Price on Amazon)
Editor's Rating : 8.8 out of 10
●MULIT-FUNCTIONAL:This is a small and waterproof tail light,rain can also be used normally.It is a hidden design Integrated Sound and light taillight +intelligent alarm + Wireless bell three functions in one of the taillights. All operations by remote control to complete.●STANDBY FOR LONG TIME:Charging time is spent 2-3 hours, for more than 30 days of standby / 15 to 20 days。The remote control battery normal use about 8-12 months.