Functions: Displays the current grip strength and maximum strength data; Save the maximum strength values when you press Save Up to 19 users' maximum strength records can be saved Displays the difference between the current users' current strength and the last saved data Displays the number of times a grip strength of 10 kg has been reached or exceeded Unit Product + Unit Package Weight and Size: 425 g; 21*14.2*4.3 cm Carton: 29.5*22*23cm/10pcs; 4.3kg / 5kg Battery type: AAA 2pcs, delivery without batteries