Pro Ears behind-the-head electronic hearing protector delivers a better fit while wearing glasses, hats or for those with longer hair. It fits snug, but not tight, so you feel secure while avoiding nasty compression headaches. Very light weight and evenly balanced so you barely know you are wearing electronic hearing protection. Pro Ears audio is designed for people who enjoy listening to music and need hearing protection. Music enjoyment should not be an afterthought. 10 mm diameter speakers, dual drivers and a top line Bluetooth chip all result in crisper sounding highs and deeper lows. Specifications for Pro Ears Stealth Bluetooth 28 HTBT Hearing Amplifiers: Manufacturer: Pro Ears NRR: 28 dB Color: Black Size: One Size Condition: New Battery Charge Time: 2 hours Features of Pro Ears Stealth Bluetooth 28 HTBT Hearing Amplifiers The omnidirectional microphones provide situational awareness so you know exactly where a sound is coming from. Noise isolation helps provide clearer phone calls. Pro Ears is known for with their proprietary DLSC technology. Pro Ears hybrid analog/digital system ensures your safety from loud sounds and you can enjoy more natural sounding amplification. 15 hours of operating time 2 hour charge time Package Contents: Pro Ears Stealth Bluetooth 28 HTBT Hearing Amplifiers 4 Sets of Foam Tips (XS S M L) 3 Sets of Silicone Tips (SML) Durable Carry Case Charging Cable USB-C Optional Wind Fliters