A series of explosions rocked Lebanon again on Wednesday afternoon, seemingly targeting handheld walkie-talkies. The day before, another coordinated pager attack in Lebanon injured thousands.

Lebanese officials reported that Wednesday's second wave of explosions killed at least 20 people and injured thousands more.

On Wednesday, there were reports of explosions in cell phones, laptops, walkie-talkies, radios, solar systems and fingerprint recognition devices.

Car, motorcycle explosions in Lebanon

An Associated Press photographer in the southern coastal city of Sidon saw a car and a mobile phone store damaged by explosive devices inside.

"Several walkie-talkies exploded in the southern suburbs of Beirut," a source told Reuters. Hezbollah-affiliated rescuers confirmed that the devices exploded in two cars in the area.

Images circulated online showed that the devices that exploded were different from the pagers that exploded on Tuesday and were larger.

The transformation of technical devices such as pagers, walkie-talkies, radios and solar devices into bombs is usually associated with illegal armed groups or terrorists using these devices to carry out attacks. These devices are originally common communication or energy tools in daily life, but because their internal structures can be transformed into detonation devices, they have become weaponized targets in certain regions.

In regions such as Lebanon, which have long faced political instability and armed conflict, many armed groups may use these tools to make improvised explosive devices (IEDs).

Basic structure and modification potential of the equipment:

• Pagers: Although pagers are now obsolete in many places, their basic structure is relatively simple and can be used as a trigger device for remote detonation by adding external circuits.
• Walkie-talkies: Walkie-talkies have radio frequency functions and can be remotely controlled through wireless signals. Militants can use the radio function of walkie-talkies to trigger explosive devices, especially in closed or inaccessible situations.
• Radios: The circuit and power supply parts of radios can be transformed into remote detonation devices, receiving signals of specific frequencies to trigger explosions. Especially in complex urban environments, such devices can be used to launch precise attacks.
• Solar equipment: Solar equipment usually has its own power supply and is easy to hide. Their batteries or other energy storage parts can be used to power explosive devices or as a source of energy to trigger explosions.

Using signal jammers is one of the effective ways to prevent walkie-talkies, radios and other devices from being used to detonate bombs, especially in areas where there are security threats like Lebanon. Signal jammers can prevent criminals from remotely detonating bombs through these devices by blocking or interfering with radio communications.

The principle of signal jammer:

1. Working mechanism: Signal jammers interfere with or block communication signals in specific frequency bands by emitting powerful radio waves, causing the walkie-talkie or radio to be unable to receive normal control signals, thereby preventing the device from being used for remote detonation.
2. Common interference frequency bands: Walkie-talkies and radios usually use specific radio frequency bands (such as VHF, UHF, etc.), and signal jammer can interfere with these frequency bands, especially in high-risk areas such as public gatherings, government buildings or military facilities.
3. Controllable range: The interference range of the signal jammer can be adjusted as needed. Some devices can cover a range of hundreds of meters or even kilometers, which is suitable for the protection of specific areas.

Using both fixed and mobile signal wifi jammer in sensitive locations and mobile fleets can cover more potential threat areas and improve protection efficiency. Before deploying signal jammers, intelligence monitoring and frequency detection can be used to identify the communication frequency bands commonly used by criminals to ensure that the jammer can accurately block the relevant signals. Security personnel need to undergo special training to learn how to use and deploy signal jammers and how to respond quickly in emergency situations. At the same time, technical support and maintenance of the equipment are also very important to ensure that it plays a role at critical moments.

Signal jammers can effectively prevent criminals from using wireless devices such as walkie-talkies and radios to remotely detonate bombs, especially in areas with security threats like Lebanon. However, cell phone jammer should be used as part of a comprehensive security strategy, combined with other preventive measures such as intelligence monitoring, searches and physical security protection to minimize threats.