Abstract: A wide-angle LED bulb has multiple LED modules, at least one light rail, and a heat radiator. The LED modules are mounted on the light rail instead of a flat chip, so the illuminating angle of the LED bulb is expanded and the light emitting efficiency is promoted. Besides, the heat radiator is made of insulating materials for preventing electrical leakage and short circuit, such that the wide-angle LED bulb has enhanced safety for use.

Abstract: An electric wheel has a transmission assembly and wheel speed detecting device mounted inside a chamber formed by two assembled sidewalls. A rubber tire surrounds the peripheries of the assembled sidewalls. Two hollow forks are respectively attached to external surfaces of the two sidewalls. A transmission ring is formed on an inner surface of one of the sidewalls and driven by the transmission assembly to rotate. As a result, the electric wheel is driven by the transmission ring and has rotating movements.

Abstract: The present invention provides a hands-free device with a replaceable adapter for a mobile phone. The hands-free device comprises a hands-free body and an adapter. The hands-free body includes a main circuit to provide a hands-free capability to a mobile phone connected with the hands-free device. The adapter is formed by sequentially combining a first plug member, a microphone member and a second plug member. The first plug member has a plurality of signal leads at one terminal to electrically and detachably connect to the hands-free body. The microphone member has a built-in microphone coupled to the main circuit for voice input. The second plug member has a plug head adapted for electrically plugging into an interface socket of a mobile phone to couple interface signals from the mobile phone to the main circuit thereby enabling hands-free use of the mobile phone.