Save energy with sensitive relays Fujitsu JV series
500, 400, 300 mW are common values of coils power consumption of mid-power relays. But JV-xS settles for 200mW and operates even at 113 mW!
Bluetooth LE (SMART) with nRF51822 onboard
If you are looking for a powerful BLE module capable of a standalone operation, probably the MBH7BLZ0X module is the right choice for you.
Does a universal signal relay exist?
To tell the truth, probably no, but we have for you a few hints for relays which are very close to an ideal.
Slim, humble and long-age - this is the Fujitsu FTR-MY relay
Despite a low power consumption this relay handles 5A/250VAC while maintaining a considerably long lifetime.