Batteries can drain while in storage so users can take them out between uses. Also be sure to store ear buds in a low humidity environment. Battery draining faster in one ear over the other could be due to one directional sound causing one to work more than the other. The primary use for the silencer ear pieces is for suppressing loud sounds, not for carrying conversations as with using these as a hearing aid.
HEARING PROTECTION EARBUDS - Walker's Silencer Digital Earbuds are designed to fit within the ear canal, enhancing quiet sounds for easier communication on the shooting range while also reducing loud noises to safeguard your hearing.
COMFORTABLE FIT - Walkers Silencer Compact In The Ear Buds won't interfere with you or your gun and cone with Secure-Lock sizing fins (comes with 3 different sized countered fins and foam buds) provides a tight and a customized fit
DETAILS - Walker's Silencer Digital Ear Buds run on two #10 batteries (includes 4), and come with a removable lanyard and a carry case for easy transportation
NOISE REDUCTION - Silencer Ear Buds provide NRR 25 dB (Noise Reduction Rating) protection against gun blasts through SAC (Sound Activated Compression)
EASY TO CONTROL - Integrated Omni directional microphones and full dynamic range speakers deliver a crisp clear sound; The speakers feature independent volume control and an off/on switch