Feature 1Use high reliability low power microprocessor. 2Compact design and easy to carry; emergency help. 3Battery life is up to 3 years; no need to replace. 4Using program automatic coding, effectively overcome the drawbacks of traditional remote control coding. 5Waterproof, anti-pressure, anti-collision automatic control equipment features, safer and more assured.Features: Use high reliability low power microprocessor. Compact design and easy to carry; emergency help. Battery life is up to 3 years; no need to replace. Using program automatic coding, effectively overcome the drawbacks of traditional remote control coding. Waterproof, anti-pressure, anti-collision automatic control equipment features, safer and more assured. Specification: Condition: 100% Brand New Material: ABS Color: White Size: approx.59*35*12mm/2.3*1.4*0.5in Power: Built-in battery Package List: 1*Wireless SOS Emergency Button Alarm