Table 2.

System power requirements of previously developed devices presented in literature

Refs.	Year	Required voltage (V)	Current (A)	Energy (Wh)	Power (W)
[31]	1999	3.6	–	–	–
[32]	2004	6–12	29 × 10−2	0.223	1.75
[21]	2008	1.5	–	–	–
[33]	2010	3.7	63.858 × 10−3	0.266	0.24
[35]	2016	3–12	15 × 10−3	–	0.5
[41]	2019	5	16 × 10−2	192	0.8