RADIOSHACK RS-4000 Alarm Nos Keyless 49-840 Radio Shack

( Brand: Radioshack ), ( Manufacturer Part Number: RS-4000 ), ( Model: 49-840 RS-4000 ), ( Type: Car Alarm ), ( Features: Keyless Entry )

Review RADIOSHACK Radio Shack Vehicle Alarm System Nos Keyless Entry

The **RadioShack RS-4000 Alarm System (Model 49-840, Keyless Entry)** is a robust, user-friendly home security solution designed to provide reliable protection for your property while offering flexibility and ease of use. Part of RadioShack s trusted line of security systems, this model combines advanced features with straightforward operation, making it an excellent choice for both first-time users and those upgrading from older systems. The keyless entry system eliminates the need for physical keys, allowing you to arm and disarm the alarm remotely using a convenient numeric keypad, which can be mounted on an interior wall or even integrated into a door frame for added convenience. This system supports up to **four separate zones**, each programmable to monitor different entry points, windows, or doors, ensuring comprehensive coverage for your home. The **audible alarm** is loud and piercing, designed to deter intruders and alert occupants or neighbors to potential break-ins, while the system also supports optional **siren activation** for enhanced security. With its **battery backup**, the RS-4000 ensures continuous operation during power outages, providing peace of mind even when the main electricity is unavailable. The system is also equipped with a **test button** to verify that all sensors and alarms are functioning correctly, allowing for regular maintenance without professional assistance. Ideal for small to medium-sized homes, the RS-4000 offers a balance of simplicity and effectiveness, making it a practical investment for those seeking an affordable yet reliable security solution. Whether you're looking to enhance your home s safety or upgrade from a basic alarm system, the RS-4000 delivers a dependable, no-frills approach to protection.

### **Pros and Cons of buying a Radio RS-4000 Alarm (Model 49-840, NoS Keyless)**

#### **Pros**

1. **Keyless Entry System** The NoS (No-Signal) keyless entry allows users to arm/disarm the system without needing a physical keychain transmitter. This is convenient for those who lose keys or prefer a more modern approach.

2. **Wireless Design** The system is wireless, making installation easier compared to hardwired alarms. This also reduces the risk of tampering with wires.

3. **Decent Alarm Sound** The RS-4000 is known for its loud and piercing alarm, which can deter intruders effectively.

4. **Durability** The unit is built to withstand harsh conditions, making it suitable for outdoor or industrial use.

5. **Affordability** Compared to some high-end security systems, the RS-4000 is relatively budget-friendly, offering good value for basic security needs.

6. **Easy Installation** Designed for DIY installation, though professional setup is recommended for optimal performance.

7. **Compatibility with Additional Sensors** While primarily a keyless entry system, it can sometimes be expanded with motion detectors or other compatible sensors (depending on model variations).

8. **Long Battery Life** The internal battery typically lasts several years, reducing maintenance needs.

#### **Cons**

1. **Limited Advanced Features** Unlike modern smart alarms, the RS-4000 lacks smartphone integration, remote monitoring, or automation features. It operates as a standalone system.

2. **No Cellular or Internet Connectivity** Without remote alerts or notifications, users must rely on the alarm sound alone, which may not be sufficient for real-time security.

3. **Basic Keyless Functionality** The NoS system is simple but lacks encryption or advanced access control features found in newer keyless entry systems.

4. **Potential for False Alarms** If not properly installed or calibrated, environmental factors (wind, vibrations) could trigger the alarm unnecessarily.

5. **No Professional Monitoring Option** Unlike systems that connect to monitoring services, the RS-4000 cannot be linked to a security company for 24/7 support.

6. **Limited Customization** Users have little control over alarm settings, such as sensitivity or response time, beyond basic arming/disarming.

7. **Dependence on Battery** While durable, the battery will eventually need replacement, and failure to do so could leave the system inoperable.

8. **Outdated Technology** Compared to modern wireless security systems, the RS-4000 lacks features like geofencing, voice assistants, or app-based control.

---

### **Conclusion**

The **Radio RS-4000 Alarm (49-840, NoS Keyless)** is a functional, budget-friendly security solution for basic keyless entry and alarm needs. It excels in simplicity, durability, and ease of installation, making it a practical choice for small businesses, garages, or homes where advanced features are unnecessary. However, its lack of smart technology, remote monitoring, and modern security enhancements limits its usefulness in today s connected security landscape.

If **basic security, wireless convenience, and affordability** are priorities, this system is a solid option. However, if **smart home integration, remote alerts, or professional monitoring** are desired, a more advanced security system would be a better investment.

### **Recommendation**

- You need a simple, wireless keyless entry alarm for a non-critical area.

- You prefer a no-frills, low-maintenance solution.

- Budget is a primary concern, and you don t require smart features.

- You want remote monitoring, smartphone alerts, or smart home compatibility.

- You need a system with expandable sensors or professional support.

- You re protecting a high-value property where advanced security is essential.

For most modern security needs, upgrading to a **smart wireless alarm system** with cellular connectivity and app control would be a more future-proof choice. However, the RS-4000 remains a reliable option for those who prioritize simplicity and cost-effectiveness.

Details:

The Radio Shack vehicle alarm system 49-840 RS-4000 is a keyless entry designed for cars, featuring two remotes included. With the Radio Shack brand reputation known for quality electronics, this alarm system ensures reliable protection your vehicle with added benefit of keyless entry capability.

part #: rs4000 price

• $22.95

specifications carsecurityi:

• brand: Radioshack
• mpn: Rs-4000
• model: 49-840 Rs-4000
• type: Car Alarm
• features: Keyless Entry

general carsecurityi:

• Vehicle Electronics GPS > Car Alarms Security > Car Alarms Security Systems
• condition: New

offer carsecurityi:

• best offers: True
• sold: 0
• options: Ship-to-home
• started: June 10, 2026
• availability: In Stock
• quantity: 1

returns carsecurityi:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller
• method: Money back

shipping carsecurityi:

• service: USPS Ground Advantage
• transit: 3-7 Days
• cost: $13.00
• type: Calculated
• carrier: USPS
• class: Standard

payments carsecurityi:

• credit card: Diners-club
• other
• wallet: Google-pay

seller carsecurityi:

• # reviews: 3110
• rating: 99.6%
• city: Missoula, Montana