Specification :
Material: Plastic
Color: Blue, Red
Size: As the picture shows
Scope: 0-180 meters
Volume: ≥80 (dB)
Power by: 3* AAA battery & 1* CR2032 battery(batteries not included)
One unit can support 8 buttons mostly.
Package Includes :
1 X Main unit
1 X Button(batteries not included)
Details Pictures :
