Ryobi RP4410A User Manual - Page 6

FEATURES KNOW YOUR SMART HEADPHONES See Figure 1, page 10. The safe use of this product requires an understanding of the information on the product and in this operator's manual. Before use of this product, familiarize yourself with all operating features and safety rules. NOTE: The earphone with the battery compartment will be referred to as the LEFT side. The earphone with the volume control will be referred to as the RIGHT side. ADJUSTABLE PADDED HEADBAND The adjustable headband is flexible and padded for operator comfort. AUTO POWER-OFF Your headphones will automatically shut down if they are not in use for four hours. 1/8 IN. AUXILIARY INPUT JACK AND CABLE Allows you to listen to MP3 and similar sound devices. LOW POWER CONSUMPTION Your headphones feature low energy requirements during normal use for extended operation. MICROPHONES The microphones allow you to hear your voice as well as background noise. They are controlled with the volume knob on the right earphone. NOISE SUPPRESSION Electronic noise suppression allows for normal human conversation while limiting the environment noise. QUICK RESPONSE CIRCUITRY Helps reduce impulse noise such as gun shots and hammer blows. ON/OFF/VOLUME KNOB The on/off/volume knob, located on the right earphone, controls the microphone level and ambient noise being transmitted through the earcups. It also turns the power on and off. PRODUCT SPECIFICATIONS Voltage 4V DC IP Rating 54* *IP Rating: Specifies the environmental protection the product enclosure provides. An IP Rating of 54 denotes protection against harmful deposits of dust and protection against water sprayed from all directions. The water resistance rating applies only when the battery cap is installed. ATTENUATION DATA ANSI S3.19-1974 Freq. Hz 125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA Class Mean 16.0 21.4 25.7 35.7 32.0 39.9 40.7 36.0 34.0 25 A Std. Dev. 3.5 3.5 2.4 3.7 3.0 3.0 3.3 4.4 6.1 The NRR calculated from these laboratory-based attenuation data is 25. Improper fit of this device will reduce its effectiveness in attenuating noise. Consult instructions for use for proper fit. The level of noise entering a person's ears when a hearing protector is worn as directed is closely approximated by the difference between the A-weighted environmental noise level and the NRR. EXAMPLE: 1. The environmental noise level as measured at the ear is 92 dBA. 2. The NRR is 25 decibels. (dB) 3. The level of noise entering the ear is approximately equal to 67 dBA. CAUTION: For noise environments dominated by frequencies below 500 Hz, the C-weighted environmental noise level should be used. Earmuffs must be worn at all times in noisy surroundings for proper protection. Although hearing protectors can be recommended for protection against the harmful effects of impulsive noise, the noise reduction rating (NRR) is based on the attenuation of continuous noise and may not be an accurate indicator of the protection attainable against impulsive noise such as gunfire. (Wording required by EPA) The EPA has selected the NRR as the measure of a hearing protector's noise reducing capabilities. Aearo Technologies makes no warranties as to the suitability of the NRR as a measure of actual workplace protection since such protection is highly dependent on user training, motivation, and utilization. A better estimate of workplace protection can be obtained by derating the labeled NRR of this, or any other hearing protector, by 50%. 6