The WPT501F from Alpha is a wireless fingerprinting pendant, water-resistant type that uses a BA510 replacement 3V lithium battery. The Alpha WPT501F Single Button Call Pendant Transmitter features the great range and reliability of 900 MHz in a small, water-resistant package. Users can wear the pendant in the shower or bathtub, outside in the rain, or other environments where the pendant may be splashed with water, or momentarily submerged. A single-button design with “press and one second hold” activation makes the pendant very easy to use, yet still reduces false alarms. When the WPT501 is activated, it continues to send an alarm signal until its reset button, located on the back, is pressed.
Alpha WPT501F Pendant Features
- Fully supervised wireless 900MHz EchoStream transmitter – Provides reliable communication over long distances, ensuring notifications are sent without delays.
- Water-Resistant – Allows for usage in various environments, making it perfect for showers or outdoor activities.
- Large alarm button with alarm activation delay – Reduces the chances of false alarms while still being easy to activate in emergencies.
- Low battery warning before battery depletion – Ensures the device is always operational by notifying users before the battery dies.
- Flashing LED indicator during alarm activation – Provides a visual cue that the alarm is active, aiding in recognition of the situation.
- Continuous alarm signal until reset button pressed – Ensures that help is continually alerted until assistance arrives.
- Field-replaceable, 3V lithium battery (model BA501) – Simplifies battery replacement, allowing users to maintain device functionality easily.
Alpha WPT501F Detailed Specifications
| Transmitter Type | Wireless EchoStream |
| Frequency | 900 MHz |
| Water-Resistance Rating | IPX4 |
| Battery Type | BA501 replacement 3V lithium |
| Alarm Button Design | Single-button with activation delay |
| Alarm Indicator | Flashing LED |
| Operating Range | Up to 500 feet |
| Dimensions | Compact and lightweight design |
| Activation Method | Press and hold |
| Reset Method | Back reset button |



















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