Description: The ab exercise machine is widely applied for all kinds of training. Simple flat support, one-handed flat support, single foot flat support, push up flat support, side flat exercises. 1.Comfortable elastic handle and thick elbow sponge pad. 2. Designed with stable structure. 3. Ergonomic design, user friendly. Display steps: keep pressing the positive timing minute key and second hand key at the same time, it will reset to 00:00, press start/stop key to start timekeeping, press start/stop key again to start timekeeping. There is no ring reminder in positive timing state. Press the second minute and second key at the same time to reset to 00:00, press the minute and second key to set the time. Press start/stop key to start timekeeping. When the time reaches 30 seconds, you can press any key to stop the call. Timing Range: 00: 00-99 minutes 59 seconds Features and Function Power Switch / Memory Function / Easy Access Battery Compartment Cover Properties: Material: ABS, Sponge Color: Black, White Size: Approx. 52cm * 32cm * 15cm / 20.47 * 12.59 * 5.9 inches Package Contents: 1*Plank Trainer Note: Please do not press the LCD hard to avoid damage. Please be careful to collision or fall off to avoid damage.