Fingertip Pulse Oximeter_Shenzhen acurio Instrument Co. Ltd. TBA: AS-301 (OLED MODEL) 6COLORS NB: TOP ROUND BUTTON & SIDE ROUND COVER NB: TOP SQUARE BTN (AS-302), NO SIDE COVER NB: TOP SEMI-ROUND BTN (AS-303), COLOR SIDE COVER, WHITE COLOR ONLY FOR CASING!!! NB: ALL MODELS BATTY_2xAAA COLORS: FOR AS-301 & AS-302 (1) DEEP BLUE (DARK BLUE) (2) GREEN (LIGHT GREEN) (3) YELLOW (4) LIGHT BLUE (5) PINK (ROSE_BAIGE) (6) PURPLE (LIGHT VIOLET)