Features 3 Channels: The Am Transmitter Is 3 Channels Design, with Frequency of 1mhz, 3mhz, And 5mhz, with Less Interference Between Channels. 1 Meter Distance: Micro Power Transmission, At A Distance Of About 1 Meter, with Stable Transmission Performance, Safe And Reliable. Applicable Field: This Am Transmitter Can Be Used for Radio Receiver Player Testing And Experimentation, with A Wide Range of Applications. Battery Powered: The Amplitude Modulation Transmitter Is Powered by A Battery (Not Included), Simple And Convenient, Can Be Used at Any Time. Compact Size: The Am Transmitter Has A Compact Size for Easy Installation And Use, And Excellent Pcb Ensures Efficient Operation Specification: Item Type: AM Transmitter Material: PCB Working Voltage: 3.6V Working Frequency: 5MHz Product Size: Approx. 10 x 5mm / 0.4 x 0.2in Power Supply: 1 x Battery (battery not included) Package List: 1 x AM Transmitter 1 x Antenna 1 x Audio Cable   Note: Battery is not provided and need to be equipped by the user. Package List 1 x AM Transmitter 1 x Antenna 1 x Audio Cable