... -capacity lithium-ion rechargeable battery10,Build-in chord melodies11,Indoor monitor size: 162×100×50mm12,Outdoor camera size: 125×93× ... about 120 hours9,Lithium battery design of the indoor monitor, best for the communication signal, unlock signal, intercom state signal10,Also ... times everyday, one charge can be used for more than 2 months.11,One monitor for one cameras or up to three12,World ...