Information according to § 5 TMG, § 55 Abs. 1 RStV:

M.I.S.S. GmbH
Breite 2
82418 Murnau am Staffelsee

Represented by:

Collin Egly
℅ M.I.S.S. GmbH
Breite 2
82418 Murnau am Staffelsee



Tel: +49-8841-4854166



Commercial registry: Amtsgericht München
Registration number: HRB  77457
VAT-ID: International VAT ID No. as specified on §27a of the German VAT Law: DE128366044


Responsible for contents according to § 55 Abs. 2 RStV:

Christian Solbach
℅ M.I.S.S. GmbH
Breite 2
82418 Murnau am Staffelsee


Online dispute resolution:

The European Commission provides a platform dedicated to helping consumers and traders settle their online disputes out of court:

Our e-mail address is:

We are not obligated to participate in a dispute settlement procedure before a consumer sacking agency and also do not voluntarily participate in such a procedure.


Privacy Notice:

For further information visit our Privacy Policy.




Animation Cycle Journey: Walkingframes (

Animationen Teena Website: Josh Schaub (

Design and Concept: Seto Studio (

App Development: Milk Interactive (

Web Development: Palmbeach Interactive (



Teena - Period Tracker & Period App

Imagine this:

A first period experience that is positive, exciting and anticipated. All of that anxiety and uncertainty around puberty, replaced by confidence and calm. What if you could accurately predict the moment you meet your superpower? Period. Puberty. Perfect.

Discovering the user’s unique personal rhythm, Teena will accurately predict the next period’s arrival. No more school or playground surprises. Our app takes a teen’s hand, acting as their personal guide to periods, puberty and beyond.

This is period positive technology with health, strength and wellbeing in focus - delivering a fun, relatable approach to period tracking. Together we build life foundations through a positive period experience and body literacy.

Tweens and teens, we’re here for you. Teena is your body’s best friend and wants you to feel 100% period ready. We are all about connecting you to your mind and body - meeting you exactly as you are and exactly as you feel today. We present two guides to your period and puberty journey, always kind and understanding, in the form of a tracker and an app.

The tracker: a personal period tracker to learn the hormone cycle through basal body temperature. Where the knowledge source is always you.

The app: valuable knowledge on everything related to the changing body. Monitor your emotions. Track your symptoms and signs. Receive daily positive feedback. An animated Cycle Journey and in-app Magazine present expert-created information delivered in a big sister style to help you develop body literacy and menstrual cycle awareness.

This is an inside job and Teena is your translator. Switching fear for fizzy excitement, we are empowering young people in their first years of modern menstruation. Nurturing trust in the body and self-confidence.

Say hello to your superpower. Join the period ready revolution.


The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis, or treatment. All content, including text, graphics, images and information, contained on or available through this web site is for general information purposes only. Teena/Valley Electronics makes no representation and assumes no responsibility for the accuracy of information contained on or available through this website, and such information is subject to change without notice. You are encouraged to confirm any information obtained from or through this web site with other sources, and review all information regarding any medical condition or treatment with your physician. Never disregard professional medical advice or delay seeking medical treatment because of something you have read on this website.