Description
Inovonics EN1235DF EchoStream Double-Button Fixed Position Hold-Up Transmitter | 902–928 MHz
The Inovonics EN1235DF EchoStream® Double-Button Fixed Position Hold-Up Transmitter provides dependable wireless emergency alarm signaling for commercial security environments. Its rugged, fixed-position design requires both buttons to be pressed for activation, helping reduce accidental transmissions and false hold-up alarms.
Designed for use with compatible Inovonics EchoStream wireless receivers and security systems, the EN1235DF operates within the North American 902–928 MHz frequency range using frequency-hopping spread-spectrum technology. An integrated back tamper can notify the security system if the transmitter is removed from its installed position, providing an additional layer of protection for fixed-location panic and hold-up applications.
A transmission LED flashes whenever the device sends a signal, providing immediate visual confirmation of operation. With three-minute supervisory check-ins, long typical battery life, and UL-listed construction, the EN1235DF is well suited for banks, retail counters, reception desks, offices, pharmacies, cash-handling areas, and other monitored commercial locations.
Important Compatibility Notice: The EN1235DF is an Inovonics EchoStream wireless transmitter operating at 902–928 MHz in North America. Confirm that the receiving equipment and security system support the Inovonics EchoStream platform before ordering.
Key Features and Benefits
- Double-button activation: Requires deliberate activation to help reduce accidental transmissions and false alarms.
- Fixed-position installation: Designed for secure mounting at a desk, counter, workstation, or other designated alarm location.
- Integrated back tamper: Supports tamper protection if the transmitter is removed from its installed surface.
- Visible transmission confirmation: The LED flashes during every transmission for at-a-glance operational confirmation.
- EchoStream wireless technology: Uses frequency-hopping spread spectrum for reliable wireless alarm communication.
- Three-minute check-in interval: Provides regular supervisory transmissions to compatible receiving equipment.
- Compact housing: Measures only 3.0 by 1.6 by 0.72 inches for discreet placement.
- Long battery performance: Typical battery life is approximately three to five years under normal operating conditions.
- UL listed: Designed for use in professionally installed commercial security applications.
Technical Specifications
| Manufacturer | Inovonics Wireless Corporation |
| Model | EN1235DF |
| Product Type | Double-button fixed-position hold-up transmitter |
| Wireless Platform | EchoStream® |
| North American Frequency | 902–928 MHz |
| RF Technology | Frequency-hopping spread spectrum |
| Check-In Frequency | Every 3 minutes |
| Battery | Panasonic CR2 lithium battery |
| Typical Battery Life | 3–5 years |
| Dimensions | 3.0 × 1.6 × 0.72 in. (7.6 × 4 × 1.8 cm) |
| Weight | 1.6 oz. (45 g) |
| Operating Temperature | 32°F to 140°F (0°C to 60°C) |
| Operating Humidity | Up to 90%, non-condensing |
| Regulatory Compliance | FCC, RoHS, UL 365, UL 636, UL 1076 and UL 1610 |
Recommended Applications
The Inovonics EN1235DF is designed for fixed locations where employees may need to discreetly initiate a hold-up, panic, or duress alarm. Common applications include:
- Bank teller stations and financial institutions
- Retail cash registers and customer service counters
- Pharmacies and controlled-substance areas
- Convenience stores and cash-handling locations
- Reception desks and administrative offices
- Healthcare facilities and staff workstations
- Government and municipal buildings
- Commercial security and monitored alarm systems
EchoStream System Compatibility
The EN1235DF must be registered with compatible Inovonics EchoStream receiving equipment before it can be monitored by the security system. Compatible Inovonics products may include:
- EN4000 Universal Serial Receiver
- EN4200 Security-Only Serial Receiver
- EN4204R Four-Zone Add-On Receiver with Relays
- EN4216MR 16-Zone Multi-Condition Receiver
- EN4232MR 32-Zone Multi-Condition Receiver
- EN5040 Series High-Power Repeaters
- EN6040-T Network Coordinator
- EN7290 Receiver/Interface for Honeywell systems
Buyer guidance: Receiver compatibility can depend on system architecture, receiver capacity, panel integration, and programming. Verify the receiving equipment, operating frequency, available alarm point, and system programming requirements before purchasing.
How the EN1235DF Helps Reduce False Alarms
Unlike a single-button alarm transmitter, the EN1235DF requires intentional double-button activation. This configuration helps reduce alarms caused by an employee accidentally pressing or bumping a single control during normal activity.
When activated, the transmitter sends a wireless signal to the registered EchoStream receiver and flashes its LED to confirm transmission. The receiver and connected alarm system determine how that signal is processed, annunciated, monitored, or reported.
Installation and Testing Guidance
- Install the transmitter indoors in a fixed position that authorized personnel can reach quickly.
- Mount the device securely so the back-tamper mechanism operates correctly.
- Register the transmitter with the compatible EchoStream receiver or integrated security system.
- Verify that the device is configured for the correct geographic frequency band.
- Perform a signal-strength and transmission test from the final mounting location.
- Confirm that the receiving panel processes the alarm and tamper signals as intended.
- Follow applicable codes, UL requirements, central-station procedures, and the manufacturer’s instructions.
- Inovonics instructs users to manually test fixed-position alarm transmitters weekly.
Professional installation recommended: Hold-up and duress devices are life-safety-related security components. Installation, enrollment, alarm response programming, and testing should be completed by a qualified security professional.
Frequently Asked Questions
What is the Inovonics EN1235DF?
The EN1235DF is a double-button, fixed-position wireless hold-up transmitter designed to send emergency alarm signals through a compatible Inovonics EchoStream security system.
Why does the EN1235DF have two buttons?
The double-button design requires a more deliberate action than a single-button device, helping reduce unintended activations and false hold-up alarms.
What frequency does the EN1235DF use?
The North American model operates from 902–928 MHz using frequency-hopping spread-spectrum technology on the Inovonics EchoStream platform.
Does the EN1235DF work as a standalone panic button?
No. It must be enrolled with compatible Inovonics EchoStream receiving equipment connected to an appropriately configured security or alarm system.
Does the EN1235DF include tamper protection?
Yes. An integrated back tamper supports notification if the transmitter is removed from its properly installed position.
What battery does the EN1235DF require?
The transmitter uses a Panasonic CR2 lithium battery. Inovonics specifies a typical battery life of approximately three to five years, although actual life varies with use and operating conditions.
How often does the transmitter check in?
The EN1235DF sends supervisory check-in transmissions every three minutes to compatible receiving equipment.
Can the EN1235DF be used outdoors?
The manufacturer’s installation guidance identifies this product for indoor use. It should be installed within its specified temperature and humidity limits.
Manufacturer Documents
Documents are provided by Inovonics Wireless Corporation. Manufacturer specifications and document locations are subject to change.
A Dependable Fixed-Position Hold-Up Alarm Solution
The Inovonics EN1235DF EchoStream Double-Button Hold-Up Transmitter combines intentional dual-button activation, tamper protection, visible transmission confirmation, supervised wireless communication, and compact fixed-position mounting. It is a strong choice for commercial facilities that require a discreet and reliable emergency alarm device within an existing or planned Inovonics EchoStream security system.
