These headphones can be fitted with optional washable earplugs. Washable earplug interconnection • 1.3m (4.25ft) cable, End with a 3.5 mm (0.14 inch) gold-plated rectangular stereo plug specification index electrical impedance each receiver 32 ohms audio frequency response of 50 Hz and 20 kHz (10 dB) power supply capacity of 50 mW (1 kHz) of 98 dB SPL/receiver sensitivity (each receiver 1 mW) mechanical index weight 70 grams (0.16 pounds) carbon (PH10736) and silver grey paint LBB 3443/00 portable headphone order information Portable earphones reproduce high quality sound with replaceable earplugs and normal cables. Order no. Lbb3443/00 LBB 3443/10 portable earphones durable cable portable earphones reproduce high quality sound with replaceable earplugs and durable cables. Order number LBB3443/10