Description: Product category: adults Electronic earmuffs Product weight: about 1 pound Product size: about 11 * 10 * 4CM (single earplug) Battery type: 2 AAA batteries (not included) Material: ABS plastic Energy: battery powered Sound level: 24 decibels Measurement system: English/standard Special function noise reduction level (NRR): 22 decibels Usage: passive protection Including components: impact sports earmuffs, 3.5 audio connection; Whether to include battery: no Average battery life: about 350 hours Content: 1 * Noise-proof Earmuff 1 * 3.5MM Audio Cable 1 * Instruction Manual Note: 1. Please note that it requires 2 AAA batteries, not included. 2. Please allow small errors caused by manual measurement. thank you for understanding