3M MT91-50 explosion-proof throat microphone

3M MT91-50 explosion-proof laryngeal microphone
brand: 3M
model: MT91-50 explosion-proof type
packaging specifications: 10 pcs/carton
product description: unique one- touch listening design, users do not need to take off the earmuffs , You can hear a clear sound just by pressing the key. After 30 seconds, the earmuffs will automatically return to the normal noise level. It can effectively avoid the hearing loss caused by workers taking off the earmuffs in the working environment. NRR: 26dB
1: High visibility, convenient for night or dark work
2: Comfortable to wear and effectively reduce noise
3: Comes with a AA battery, Easy to replace.
Tips: NRR: Single value noise reduction value tested in accordance with the American standard ANSI S3.19-1974.
SNR: Single value noise reduction tested in accordance with the international standard ISO 4969-2.
Instructions for use:
1. Stretch the headband to the maximum “open” position and cross the top of the head to cover the ears;
2. Relax the headband and adjust the height of the cup until the headband can support the cup. And until both ears feel comfortable;
3. The soft cushion of the earmuffs should fit closely to the head
4. Adjust the headband to ensure correct tightening and effectively isolate noise