Abstract: A fastening structure for portable electronic device includes a cover, a main body and a latching member. The cover includes a hook. The main body defines a receiving cavity. The latching member is attached to the main body. The latching member includes a locking portion received in the receiving cavity. The cover is locked on the main body by engagement between the hook and the locking portion.

Abstract: A circuit board structure includes a rigid circuit board, a flexible circuit board connected to the rigid circuit board and a fixing member positioned between the rigid circuit board and the flexible circuit board. The flexible circuit board is folded over the rigid circuit board. The fixing member is secured to the rigid circuit board latching the flexible circuit board.

Abstract: A battery holder includes a main body, a housing and a latching member. The main body defines a chamber for receiving a battery. A locking portion and a latching portion are positioned at one end of the chamber. An entrance is formed between the locking portion and the latching portion. The entrance allows the battery to be inserted into the chamber. The housing is attached to the main body and covers the chamber. The latching member includes a first end portion and a second end portion. The first end portion is rotatably attached to the latching portion, and the second end portion is detachably attached to the locking portion.

Abstract: A light guide assembly includes a light source and a light guide plate. A through hole is defined in the light guide plate to receive the light source. A plurality of spaced apart apertures is defined in the light guide plate to allow the light rays to from the light source to be transmitted to illuminate the distal end of the light guide plate.