Nurse Calculator Nursely Although I have never used it, please purchase only if you understand that it has been stored by a non-professional. Immediate purchase is OK. ● Size (cm/approx.) / Length 11.8 x Width 4.3 x Thickness 1.2 ● Weight / Approx. 45g (including battery) ● Material / Body: ABS resin ● Power supply / Lithium battery CR2025 x 1 ● 8-digit display in calculator mode ● Settings / Possible up to 99 hours 99 minutes 99 seconds Neck strap and battery are not included.