[. . . ] However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Shielded cables and I/O cords must be used for this equipment to comply with the relevant FCC regulations. [. . . ] M: The signal delivered by the microphone is muted while power and the RF carrier frequency remain on. This prevents the receiver from responding to interference from other transmitters. Charging contacts for charging a rechargeable battery inside the battery compartment using the optional CU 40 charger. Pull the battery compartment lid (1) down to remove it from the transmitter. If you do, the battery will not be held in place properly and may cause a rattling noise. If there is a dead or defective battery inside the battery compartment, remove the battery. Insert the supplied or new battery (2) into the battery compartment as shown in fig. If the status LED (4) lights constantly the battery will be dead within about 60 minutes. Slide the battery compartment lid (1) onto the transmitter against the direction of the arrow to the point that the lid (1) will click shut. The talker's jacket, making sure the clip (2) will be on the outside of the pocket and the microphone (3) will point upward. If no suitable pocket is available, slip the supplied necklace cord (4) under the clip (2) and place the necklace cord (4) around the talker's neck. Use a small screwdriver to turn the input gain control (3) on the transmitter to a position halfway between the left and right stops. Slide the transmitter (1) into a shirt pocket or an outside breast pocket of 14 If your voice sounds distorted on the loudspeakers turn the input gain control (3) down CCW to the point that you will hear no more distortion. If your voice sounds too quiet on the loudspeakers, turn the input gain control (3) up CW. If the loudspeakers start howling due to acoustic feedback, immediately turn the input gain control (3) back down to the point that the howling will stop. 5): If feedback occurs even at low volume levels, you can detach the microphone from the transmitter and position it closer to the talker's mouth to reduce the risk of acoustic feedback. [. . . ] Nest the hook (3) on the black replacement clip into the matching opening (4) in the transmitter (2). Press the bent end of the replacement clip against the transmitter (2) to make it snap into place. At 1 kHz Compander Signal/noise ratio RF output Current consumption Power requirement Battery life Audio input level for rated deviation Size (WxDxH) Net weight 710 to 865 MHz FM 40 to 20, 000 Hz ±15 kHz 15 kHz (SP1, SP2: 13. [. . . ]