Specification:Item Type: Bike AlarmMaterial: ABSHost Size: Approx. 94 x 42 x 23 mm / 3.7 x 1.6 x 0.9 inColor: BlackFrequency: 433.92 MhzRemote Control Distance: 20 m / 787.4 inAlarm Volume: 113dB (Distance: 30 cm / 11.8 in)Operating Temperature: -20 to 60 Degrees CelsiusStorage Temperature: -30 to 70 Degrees CelsiusHost Battery: 12v/27a Alkaline Lithium Battery 500 mA (built in, Standby for more than 1 year)Remote Control Battery: Button Battery CR2025 150 mA (built in)How to Use:1. You can pair up to 8 remote controls, press the disarm key of the first remote control, and then long press the key.2. After the alarm beeps, press the deployment key of the new remote control, and the alarm will beep Beep, beep.Package List:1 x Alarm (Battery Included)1 x Remote Control (Battery Included)2 x Tie Wire1 x Double Side Tape1 x Charging Cable1 x User Manualor1 x Alarm (Battery Included)2 x Remote Control (Battery Included)2 x Tie Wire1 x Double Side Tape1 x Charging Cable1 x User Manual