Waterproof protection, rain or shine, short time intrusion into the water, light rain or short period of medium to heavy rain is fine, but do not recommend a long period of time in the rain, in order to prevent water malfunction. Compact appearance design, multi-function code meter economical and practical subtitle. HD large screen design, high clarity, clear at a glance. No signal input within 300 seconds, the screen will enter standby mode, the clock is retained. When there is a traveling signal input or press any key can be restored to the mode before shutdown, and memorize the values before shutdown. Waterproof, dustproof and earthquake-resistant, light and easy to use, very suitable for children's training, such as swimming, running, football, basketball and so on.