Material: ABS plastic Product size: Approx. 11 * 10 * 4CM(Single earplug) Color (optional): Black Battery type: 2 AAA batteries (NOT Included) Energy-source: Battery powered Sound level: 24 dB Measurement System: English/ Standard Special function noise reduction level (NRR): 22 dB Usage: Passive protection Included component: Impact Sport earmuffs, 3.5 audio connections Whether include battery: NO Average battery life: about 350 hours Package Included: 1 x Noise-proof Earmuff 1 x 3.5MM Audio Cable 1 x Instruction