Wireless Calling System Color:Four Key-Black Its robust construction means that

Its robust construction means that it is durable and long-lasting

All the electronic components are in the detector but the location information is held in the base

Brand Name: Retekess

providing long-lasting durability in various environments

Wireless Calling System Color:Four Key-Black Its robust construction means thatSPECIFICATIONS Brand Name: Retekess Model Number: T128 Certification: CE Certification: FCC Watch Working voltage: DC3. 7V rechargeable Li poly battery Watch Input power: 5V Watch Receiving distance: 80 meter (open area) Button Power: 2pcs 3V CR2016 battery (included) Four key: Call, Cancel, Pay, Order Choice: yes