Women"s electronic counter chest expander. Material: ABS/latex sponge. Dimension: 45 cm long; Outer diameter: 10 mm; Inner diameter 6 mm Weight: 94.1 g Battery life: more than 6 months Quality warranty: one year Features: 1.counting, timing, and calories. 2.latex tube, safe and comfortable. 3.suitable for children and women. 4.Help chest muscle, back muscle, deltoids and trapezius muscle and lozenge muscle more exercise.