The Samsung Sound Mate is a quirky, ultra-portable clip-on speaker.

History: It was bundled with the legendary Samsung SGH-D500 slider phone released in 2004.

Function: Because early cell phones had incredibly quiet built-in loudspeakers, this tiny external accessory plugged directly into the phone's proprietary charging/audio jack to instantly double the volume for MP3 playback and hands-free calls.

Power: It required no batteries and draws power straight from the phone.