1, body color and pattern: the classic ultraman gel pen is blue or black with the words "ultraman" in white or red on it. The optimized version and the upgraded version will have different colors and designs.

2. Cap: Press the cap, which is the hidden mode of Altman's blind pen. Press it and the refill will be exposed.

3. Sound: Press the refill gently on the hard surface and listen to the sound of the refill falling on the hard surface. Hidden model, the sound of the pen core falling on the hard surface is "click" or "knock", and the timbre is crisp; Not hidden mode. The sound made by the pen core falling on a hard surface is "click" or "knock", and the timbre is dull.