SCP-1091 is a sentient entity that resides in radio receiving and transmitting devices. If its host device possesses microphone (or shortwave reception equipment) and speakers in, SCP-1091 is capable of communicating.

SCP-1091 is capable of transferring itself between hosts by radio signal, at a range dependent on the broadcast power of its host device. Given the opportunity, it will use its ability to transfer between devices rapidly in an attempt to C. SCP-1091 must not be allowed to reach its destination. Should such a scenario become a possibility, [DATA EXPUNGED].

Thus far, SCP-1091 has not demonstrated an ability to infect multiple devices simultaneously. However, this possibility cannot be entirely discounted.

If the host of SCP-1091 is destroyed or otherwise rendered unable to transmit before it is able to transfer, SCP-1091 will immediately become located in SCP-1091-1, regardless of distance. For this reason, it has been suggested that SCP-1091-1 is the original source of SCP-1091.

SCP-1091-1 resembles a model S-38 shortwave receiver, manufactured by the Hallicrafters company in the mid-1940s. However, the composite material comprising the outer shell of SCP-1091-1 appears to be a mixture of carbon fiber and an unidentified material. Additionally, all attempts at opening SCP-1091-1 for examination have failed.

All attempts to tune SCP-1091-1 have been ineffective. SCP-1091-1 plays only static until SCP-1091 initiates communication. Any other radio device within 500 meters of SCP-1091-1 will experience the same tuning failure. SCP-1091 is able to communicate with [DATA EXPUNGED] through various types of “Digital Mode” broadcasts. The choice of digital mode appears to be related to the person it is communicating with and the subject matter of the conversation.

An extended version of this report has been edited for public release and embedded as a MYTHIC/MEMETIC entity on the archives of the SCP Foundation.