OEM Blackberry Earpiece (HDW-03458-001) BlackBerry 2.5mm OEM Earbud with On-Off. Factory original RIM Blackberry HDW-03458-001 headset weighs less than 1 ounce. Send & End button can also initiate Voice-dial on voice-dial equipped cell phone models. In-line microphone/ mic reduces background noise, & increases the volume & clarity of your voice.