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Basic function interconnect ? 1.2m (4ft) cable with 3.5mm (0.14in) straight Angle gold-plated stereo plug at end. Certificate and approval certification European CE technical specifications for electrical indicators each receiver 150 ohms impedance audio frequency response of 50 Hz to 5 kHz (10 dB) amplifier ability of 60 mW (1 kHz) of 107 dB SPL/receiver sensitivity (each receiver 1 mW) mechanical index weight 33 grams (0.07 pounds) of black color order information LBB 3441/10 chin chin type headsets, equipped with 1.2 meters (4 feet) cable, End with 3.5mm (0.14in) right Angle gold-plated stereo plug. LBB 3441/50 earplugs with hardware accessory LBB3441/10 for LBB3441 earphones (500 sets) LBB3441 earphones (500 sets) replaceable earplugs (500 sets). Order number LBB3441/50