DFRobot Xbee Shield for Arduino Surface mount devices are usually

Surface mount devices are usually tiny and without wire leads

and other forms of overload protection can be built into the PSU to help protect against voltage spikes or short-circuiting

DS1000Z series are 4-channel digital oscilloscope bandwidth 70MHz ~ 100MHz

Positive Pulse and Negative Pulse

Resistance (2-wire and 4-wire): 200 O - 100 MO

DFRobot Xbee Shield for Arduino Surface mount devices are usuallyDescription: The XBee Expansion Board is a compliant solution designed to meet low cost, low power wireless sensor networks with special needs. The module is easy to use, low power consumption, and the provision of critical data between devices reliable transmission. As the innovative design, XBee PRO can be in the range 2 3 times beyond the standard ZigBee modules. XBee PRO modules work in the ISM 2. 4 GHz frequency band. The MaxStream's XBee (1 mW)