Product information: How to use: earplugs Model: M20 Color: black, army green, mud Characteristic: Noise reduction value + NRR22 intuitive one-button operation, rechargeable, high endurance Two sound effects modes (indoor, outdoor) to turn on, turn off, and low battery prompt Automatic shutdown when charging, automatic shutdown after two hours without operation High portability, high comfort, high compatibility, with silicone anti-lost rope Three sizes of ear buckles and earplug accessories come with a data cable for charging ●IPX-4 waterproof rating Automatic shut-down: When the headset is idle for nearly 2 hours, a beep will appear, and the headset will appear after more than 2 hours of inactivity. It will automatically shut down and emit 3 beeps. When the headset is turned on, it will automatically turn off when it is put into the charging box. If you need to restart, just press the ON/OFF button again to restart. The noise reduction level can be changed: In order to reduce the echo and reverberation when shooting in indoor and outdoor environments, the headset has developed two noise reduction levels, indoor mode and outdoor mode. Packing list: ·A pair of M20 electronic hearing protection earplugs (with a pair of medium-sized ear buckles and a pair of medium-sized earplugs) ·Portable lithium battery charging box*1 ·Silicone anti-lost rope*1 ·Charging cable*1 ·A pair of small ear buckles & earplugs·A pair of large ear buckles & earplugs·Instruction manual*1

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