Solid state circuitry allows normal speech and sounds to be heard but automatically deadens noise above 85dB. On/Off switch with adjustable volume control. Auto-adjust head band. Requires 2 x AA batteries, providing approx 200hrs of use. Conforms to EN352-1. Protection levels: H=30 M=28 L=22 SNR=30dB.Product Details Solid state circuitry allows normal speech and sounds to be heard but automatically deadens noise above 85dB On/Off switch with adjustable volume control Auto-adjust head band Requires 2 x AA batteries, providing approx 200hrs of use Conforms to EN352-1 Protection levels: H=30 M=28 L=22 SNR=30dB Deadens noise above 85dB Allows speech to be heard Solid state electronic circuitry Rotary on/off adjustable volume control Requires 2 x AA batteries We deliver Silverline Electronic Ear Defenders SNR 30dB worldwide.We specialise in shipping almost anywhere in the world securely at competitive prices - across UK, US, Canada, Ireland, New Zealand, Europe - securely and fast at competitive prices