highly sensitive NO reed relay, 10/90 euro mfg. orig. rated 5V, 700 ohm, 7mA, low profile pkg.  to improve performance, each relay has been magnetically modified and individually precision tuned and functionally tested at 5V,  at only 300uA. or less, coil current (vs 7mA),  which is made possible by unique magnetically assisted action.  max rated at up to 1/2 amp, 150 volts, with fully isolated NO contacts. ....by using a 10Kohm series coil resistor, it will activate, at a mere 500uA, 3-5V, or 22Kohm at 12V,  which is  much less than the coil power for a typical reed at 5V, 5-10 mA, a battery killer in the prolonged energized state and quite power hungry by today's standards.   the relay drive transistor can also be eliminated......  this is a very sensitive relay that outperforms transistor/ MOSFET AC/DC switching.........(with hi-z input and fast, wide bandwidth--infinity or 0.00 ohms output,  ACorDC).....plus  environmentally sealed contact reliability.......DIY/ experimenters take note ! ...... for example, take advantage of the low coil power to employ multiple relays. add an inverter transistor for low-power logic activated studio quality audio switching, SPDT/ DPDT, or mute, input selector, etc. another use is in RC timing ckts.   observe coil polarity - see red dot for "+".    thanks for viewing and  interest !   high magnetic fields may require shielding or higher coil current (smaller than 10K resistor)....order qty is for 6 relays as pictured, resistor not included.   shipped in bubble mailer. lumps make it a hand cancel, resulting in an expensive USPS charge. :(   this vintage lot  in work, for sale, is 200 pcs.     now, a second generation design. .... reorder after item relisting.   please allow up to 1 week processing, prep-to-ship.